Ferdinand Ngoula | University of Dschang, Cameroon (original) (raw)

Papers by Ferdinand Ngoula

A total of twenty-four cane rats with an average initial weight between 500-700g were randomly al... more A total of twenty-four cane rats with an average initial weight between 500-700g were randomly allotted to four dietary treatments (R0, R1, R2 and R3) containing 0,10,15 and 20% toasted full-fat soybean grains as replacement for maize and wheat brand pellets respectively. Freshly harvested Pennissetum purpureum (basal diet) was served ad libutum to the treatment groups. The experiment spanned 72 days during which average data on feed intake (g), body weight gain were collected and feed conversion ratio (FCR) calculated. No significant difference (p>0.05) was observed between treatment groups for feed consumption and weight gain. Male cane rats fed R2 diet recorded a significant (p<0.05) higher feed intake compared with the females fed on the same diet. Similarly, weight gain was significantly (p< 0.05) higher for the male cane rats fed diet R2 compared with the females fed on the same diet. Generally, feed conversion ratio (FCR) decreased with increasing levels of the test diets. Mail cane rats fed R2 diet recorded a significant (p<0.05) lower FCR compared with the rest of the treatments. Full-fat toasted say bean meal can incorporated up to 10 and 15% levels in a maize-wheat brand concentrate meal for female and male cane rats, respectively without adverse effect on the growth performance.

Open access journal of veterinary science & research, 2019

Spirulina, a filamentous cyanobacterium, possesses diverse biological activities and nutritional ... more Spirulina, a filamentous cyanobacterium, possesses diverse biological activities and nutritional significance due to high concentration of natural nutrients. This work aimed to evaluate the effects of hydro-ethanolic extract (HEE) of Spirulina platensis on organ weights, sperm characteristics, reproductive hormones and fertility index in male rabbits. 30 male rabbits were randomly distributed into 5 groups (6 rabbits/group). For 120 days, group 1 animals (control) were orally given distilled water, those of group 2 were treated with 100 mg/kg bw of vitamin E, while groups 3, 4 and 5 received respectively 100, 200 and 400 mg/kg bw of spirulina extract. The results showed that the relative weights of the vas deferens and sexual glands increased significantly (p<0.05) in the HEE groups compared to the control, whereas no significant (p>0.05) difference was noticed in the weights of testes and epididymis, sperm mobility and membrane integrity. Sperm count was significantly (p<0.05) higher in animals given 400 mg/kg bw of HEE of spirulina with reference to all other treatments. The sperm morphological anomalies declined significantly (p<0.05) in HEE-treated rabbits compared to distilled water and vitamin E-given animals. The serum concentration of FSH decreased significantly (p<0.05) in rabbits receiving 400 mg/kg bw of HEE of spirulina compared to those of other groups. Meanwhile, that of LH did not show any significant (p>0.05) difference among treatments. The serum content in testosterone increased significantly (p<0.05) in spirulina extract-treated and vitamin E groups with reference to the control group. The litter size and the sex ratio did not present any significant (p>0.05) difference among treatments. The kid weight at birth and the litter size at weaning increased significantly (p<0.05) in spirulina extract-treated and vitamin E groups with the reference Research Article Volume 4 Issue 2

International Journal of Biological and Chemical Sciences, May 15, 2009

Maneb et Chlorpyrifos-Ethyl sont des pesticides utilisés en grande quantité dans les cultures viv... more Maneb et Chlorpyrifos-Ethyl sont des pesticides utilisés en grande quantité dans les cultures vivrières au Cameroun. Pour évaluer les risques de toxicité et leur influence négative sur la biodiversité aquatique, des bioessais de toxicité aiguë sur des individus d'Oreochromis niloticus ont été réalisés séparément avec six concentrations (0 ; 1,80 ; 1,85 ; 1,90 ; 1,95 et 2 mg/l) de Maneb et (0 ; 0,15 ; 0,16 ; 0,17 ; 0,18 et 0,19 mg/l) de Chlorpyrifos-Ethyl en trois répétitions en milieux statiques dans des aquariums pendant 24h. Des mortalités minimales (20,00 ± 0,00%) et maximales (100,00 ± 0,00%) ont été enregistrées chez les alevins (taille moyenne 3,86 ± 0,04 cm et de poids moyen 0,74 ± 0,02 g) avec respectivement 1,85 et 2 mg/l de Maneb puis 0,15 et 0,19 mg/l de Chlorpyrifos-Ethyl. Des corrélations (r = + 0,96 pour le Chlorpyrifos-Ethyl et r = + 0,98 pour le Maneb) ont été positives et fortes entre les taux de mortalité et les concentrations. La concentration létale 50% pendant 24 heures d'exposition (CL 50-24h) a été relativement élevée avec le Maneb (1,93 mg/l) et faible avec le Chlorpyrifos-Ethyl (0,154 mg/l) qui s'avère le pesticide le plus toxique et qui provoque de plus un habitus particulier chez les poissons survivants.

Bulletin of animal health and production in Africa, Jun 26, 2008

A total of 112 local “Bamileke” breed sows (22 pregnant and 90 non pregnant) from Cameroon were u... more A total of 112 local “Bamileke” breed sows (22 pregnant and 90 non pregnant) from Cameroon were used to study the effect of pregnancy on the level of serum minerals: calcium (Ca), sodium (Na), potassium (K) and magnesium (Mg). The quantity of minerals in the serum of individual sow was determined by atomic absorption spectrophotometer. The level of studied minerals was relatively higher in gravid sows as compared to non gravid. However, the difference was significant only for the sodium. Gestation length and the foetus sex-ratio did not affect significantly the serum minerals level. Positive and significant correlations were found between litter size and the studied minerals rate. Highly positive correlations was also recorded between the number of cyclic corpus lutea and the level of Na (r = +0,85) in one hand, and in other hand the number of gestative corpus lutea and the serum Ca (r = +0,75). The level of Ca, Na and K increased during the luteal phase as compared to the follicular phase; the contrary was found for the Mg level. These results show that the serum level of Na could be used to diagnose the pregnancy and also to estimate the ovulation rate; while the K level could contribute to the estimation of the number of gestative corpus lutea. De Juin a Septembre 2002, l'influence de la gestation sur les taux de calcium (Ca), de sodium (Na), de potassium (K) et de magnesium (Mg) seriques a ete etudiee chez 112 truies de race « Bamileke » dont 90 vides et 22 gravides issues des elevages traditionnels de l'Ouest du Cameroun. Le dosage des mineraux a ete fait au spectrophotometre a absorption atomique a partir de serums de truies mineralises. Le taux de mineraux etudies a paru plus eleve chez les truies gravides compare a celui des vides. Cependant, cette elevation n'a ete significative (P =0,05) que pour le taux de sodium. La duree de gestation et le sex-ratio des foetus n'ont pas affecte significativement (P=0,05) la teneur serique en mineraux etudies. Des correlations positives mais faibles (p=0,05) ont ete trouvees entre la taille de la portee et la teneur serique en mineraux consideres. En outre, des correlations positives et fortes (P=0,05) ont ete enregistrees entre le nombre de corps jaunes cycliques et le taux de Na (r = + 0,85) d'une part, et entre le nombre de corps jaunes gestatifs et la teneur serique en Ca (r = 0,75) d'autre part. Les taux de Ca, Na et K ont augmente pendant la phase luteale compare a la phase folliculaire, a l'inverse du taux de Mg ; aucune difference significative (P=0,05) n'a toutefois ete relevee. Ces resultats montrent que chez la truie, la teneur serique en Na pourrait permettre de diagnostiquer la gestation d'une part, et d'estimer le taux d'ovulation d'autre part ; alors que le taux de K permettrait d'estimer le nombre de corps jaunes gestatifs. Bulletin of Animal Health and Production in Africa Vol. 54 (4) 2006: pp. 278-285

International Journal of Poultry Science, Jun 15, 2019

HAL (Le Centre pour la Communication Scientifique Directe), 2020

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

International Journal of Zoology

To assess the effect of energy levels on the reproductive performance of African Land Snails, nin... more To assess the effect of energy levels on the reproductive performance of African Land Snails, ninety young snails of one month of age, weighing between 1 and 1.5 g, of shell length between 15.5 and 23.85 mm and shell diameter between 12.60 and 16.85 mm and free from wounds or shell defects were divided into 3 groups of 5 snails each and 6 replicates in cages equipped with feeders and drinking troughs. Each treatment was randomly assignedto one of the experimental feeds with variable energy levels (2600, 2800, and 3000 kcal/kg) in addition to pawpaw leaves as a staple feed. The cultured substrates were watered daily, and the animals were monitored for a period of 24 months. The results showed that the shortest ages of onset of maturity as well as the highest number of spawns per treatment were observed in snails receiving 2600 kcal/kg of energy in the feed compared to other treatments. The highest egg morphometric and fertility characteristics were found in animals fed the highest en...

Bulletin of animal health and production in Africa, 2007

The domestication of grasscutter ( Thryonomys swinderianus , Temminck) in West Cameroon is widesp... more The domestication of grasscutter ( Thryonomys swinderianus , Temminck) in West Cameroon is widespread but many of their pathological conditions are poorly understood and unresolved resulting in wastages or mortalities in colonies. This survey was therefore carried out in West Cameroon (LN 5-70 and LE 90-110) to determine the prevalence of diseases and causes of mortality in captive grasscutters in relation to planning control programmes. From the main results obtained in this study, respiratory disorders (29.19%), traumatic injuries (29.81%) and gastrointestinal diseases (22.36%) were the most important clinical diseases and cause of mortality (30, 27.5 & 21.25% respectively) of captive grasscutter. Also, out of 360 deliveries 15.56% postnatal mortality was observed. The diseases occurred all year round but peaked in August and September and many infectious agents were recorded during the period of the study are described. There is need for the standardisation of control or treatment measures of diseases of captive grasscutters whose prevalence, though influenced by season, is the main constrain towards improvement of stock levels, intensification of production and management practices. La domestication des aulacodes (Thryonomys swinderianus Temminck) est repandue a l'Ouest du Cameroun. Cependant, plusieurs de leurs conditions pathologiques sont mal comprises et non resolues, ce qui entraine les deperissements ou les mortalites dans les colonies. Cette etude a donc ete menee dans l'Ouest du Cameroun (LN 50 – 70 et LE 90–110) dans le but de determiner la prevalence des maladies et les causes de mortalite des aulacodes en captivite en relation avec les programmes de controle et de planification. Selon les principaux resultats obtenus dans cette etude, les problemes respiratoires (29,19%), les traumatismes (29,81%) et les maladies gastro-intestinales (22,36%) ont ete les maladies cliniques les plus importantes et les causes de mortalite (30 ; 27,5 et 21,25% respectivement) des aulacodes en captivite. De meme, sur 360 mises bas, 15,56 % des mortalites post-natales ont ete observees. Les maladies surviennent toute l'annee avec un pic en aout et en septembre. Plusieurs agents infectieux sont enregistres pendant cette periode de l'etude. Il est necessaire de standardiser le controle ou les mesures de traitement des maladies des aulacodes en captivite dont la prevalence bien que influencee par la saison, est la principale contrainte a l'amelioration du cheptel, a l'intensification de la production et aux pratiques de gestion. Bulletin of Animal Health and Production in Africa Vol. 54 (4) 2006: pp. 27-32

This study was designed to study the effects of Amprolium (anticoccidial drug) on some productive... more This study was designed to study the effects of Amprolium (anticoccidial drug) on some productive and reproductive parameters in female rabbit. For this purpose, 24 nulliparous local breed rabbits, aged 7 months on average were divided into four groups of 6 animals each, and randomized into 24 cages. Amprolium was administered at doses of 0.00, 0.20, 0.32 and 0.80 g/L of drinking water for 8 weeks (4 weeks before and after mating). The average Amprolium intake from the calculated water consumption was 0.00, 32.00, 69.00 and 136.00 mg/kg body weight. The main results showed that the pregnancy length of treated rabbits decreased with increasing doses of amprolium, with a significant difference (p 0.05) on feed and water consumption, body weight gain, feed efficiency, average weight at birth, sex-ratio and viability of young rabbits in any of the study groups. These data demonstrated that Amprolium exerts an adverse effect on female fertility at all the considered doses.

IOSR Journal of Agriculture and Veterinary Science, 2020

Background:Feed additives are a group of nutrient and non-nutrient compounds which helps farmers ... more Background:Feed additives are a group of nutrient and non-nutrient compounds which helps farmers in improving the efficiency of feed utilization and thus reducing the high cost of feed. The current study aimed to determine some reproductive performances of local Kabir rooster fed with diets supplemented with thyme (Thymus vulgaris, Lamiaceae) powder. Materials and Methods: A total of 40kabir chicks were divided into four groups on the basis of the diet. One group (T0) received a basal diet (control),two others received a basal diet supplemented with 0.5% (T5) and 1% (T10) of thyme powder while the fourth (TOxy) received a commercial antibiotic, Oxykel 80 WP (0.5g/L H2O). From the 24 th week old, six roosters of each group were bred with females and eggs were collected and incubated to evaluate fertility and hatchability. At 28 th week, the chickens were weighed; their comb and wattle size measured and they were slaughtered thereafter. Blood was collected for hormonal assessment. Col...

Genetics and biodiversity journal, Jan 25, 2021

Between February and May 2019, in the equatorial forest urbanized area of Cameroon (Mfoundi), a s... more Between February and May 2019, in the equatorial forest urbanized area of Cameroon (Mfoundi), a study was conducted and aimed to contribute on a better understanding of the biodiversity of edible snails for their genetic improvement and conservation. A total of 693 adult snails of two species: Archachatina marginata and Achatina fulica were collected in the various localities (Odza, Mbankolo, Biyem-assi, Nyom, Nkolbisson and Simbok). Information about biometric morpho characters was collected using a survey sheet, an electronic scale of 7000g capacity with accuracy of plus or minus 1g, a sliding foot with an accuracy of plus or minus 0.01 millimeter. A digital camera will be used for the subsequent morphological assessment of the animals. Results revealed significant influence of locality on all the morphobiometric characteristics. The shell color of A. marginata was black with yellowish stripes and the red tip was the most frequent (62.85%); while for the species A. fulica it was brown with white stripes and white tip (76.09%). The most common color of the foot in A. marginata was brown with white traces (41.70%) and in A. fulica, it was black (82.50%). The number of shell turns in A. marginata was higher in the localities of Mbankolo (5.36±0.12) and Odza (5.38±0.05) while in A. fulica it was higher in the locality of Simbok (7.41±0.49). Concerning body measurements (in mm), the total body length of A. marginata was higher in Nkolbisson (88.10±1.30) and that of A. fulica was greater in Simbok (112.25±12.16). The live weight (g) of A. marginata was higher in Mbankolo (70±0.00) on the other hand, that of A. fulica was higher in Simbok (80±0.02) and Nyom (80±0.12). The diversity observed suggests that edible snails constitutes rich natural genetic resources enough variability to envisage genetic improvement and develop preservation schemes for these snails mostly collected from wild.

World's veterinary journal, Mar 25, 2021

GABJ

In order to study the biodiversity of Cameroon indigenous Djallonke sheep, a study was conducted ... more In order to study the biodiversity of Cameroon indigenous Djallonke sheep, a study was conducted between July and September 2016 in the Sudano-Guinean zone of Cameroon. A total of 280 adult sheep (24 months old) including 77 males and 203 females from 112 farms in 13 districts of 4 divisions was measured and analyzed. The variance analysis showed variability in the population. According to the principal components analysis, the body length, chest circumference, withers height and the live weight were potentially discriminating characters of the ovine population studied. The discriminant analysis revealed a population made of three genetic types with genetic type I having the highest characteristics. The phylogenetic analysis showed that type II and III are closer and type I and III are genetically more distant. High intra-genetic variability was observed within the population studied. The linearregression equation (LW = 0.8092CG + 58.923) with a coefficient of determination (R2 = 0....

Open Journal of Animal Sciences

The successful application of assisted reproductive techniques (ARTs) in ovine as in other mammal... more The successful application of assisted reproductive techniques (ARTs) in ovine as in other mammal species relies on many factors among which the quality of the semen used. After collection, semen samples are generally processed for storage (liquid storage or cryoconservation) before being used for insemination or in vitro embryo production.

Zoonotic abortive diseases represent a significant health and economic risk for livestock farmers... more Zoonotic abortive diseases represent a significant health and economic risk for livestock farmers and animal health stakeholders in Cameroon. This cross-sectional survey was conducted from April to October 2021 among 200 selected small ruminant farmers in the three northern regions of Cameroon. Data collection was done through semi-structured questionnaires administered by exchange with the herder and responses were coded and recorded on an Excel spreadsheet. The data were then analyzed with R software, version 2.13.0. An ANOVA test was used to assess significant differences in mean KAPP scores between regions. Pearson correlations were used to calculate the association between KAPP scores within regions. Small ruminant farmers surveyed had low mean scores for knowledge of abortive Toxoplasmosis and Chlamydia (0.1 ± 0.2), desirable attitude (0.32 ± 0.07), appropriate practice (0.36 ± 0.13) in managing abortion, and positive perception of zoonotic risks of Toxoplasmosis and Chlamydia...

Toxoplasmosis and abortive chlamydia continues to spread and cause considerable economic losses i... more Toxoplasmosis and abortive chlamydia continues to spread and cause considerable economic losses in small ruminant farms. The objectives of this study were to determine the seroprevalence and highlight the risk factors associated with Toxoplasma gondii and Chlamydia abortus infection in small ruminants in Cameroon. A cross-sectional study was conducted in 200 small ruminant farms during a period from April to October 2021. A total of 1061 small ruminants were sampled and the sera obtained were analysed using the indirect multi-species ELISA test for toxoplasmosis and abortive chlamydia at the national veterinary laboratory. A questionnaire was constructed to collect information about ﬂock management and animal risk factors possibly associated with Toxoplasma gondii and Chlamydia abortus infection in goats and sheep. Overall, 329 small ruminants tested positive for Toxoplasma gondii and 45 for Chlamydia abortus with a prevalence of 31.01% (95% CI: 28.23 - 33.79) for toxoplasmosis and ...

World's veterinary journal, Mar 25, 2021

Dichrostachys glomerata (D. glomerata) is an aromatic plant which is used as a spice in cooking a... more Dichrostachys glomerata (D. glomerata) is an aromatic plant which is used as a spice in cooking and Cameroonian traditional medicine to treat infertility in men. This work was designed to highlight the effects of the ethanolic extract of D. glomerata on oxidative status, serum metabolites and reproductive characteristics in female guinea pigs (Cavia porcellus). A total of 48 primiparous female guinea pigs, aged 4 months old with the body weight of 400 ± 10 g, were divided into four groups with two replications per group (6 guinea pigs each). During 90 days of trial, Group 1 (control group) orally received 1 ml/kg b.w. of distilled water daily, and groups 2, 3, and 4 received D. glomerata ethanolic extract once a day at doses of 50, 100, and 200 mg/kg b.w. using the same method of administration, respectively, for 90 days, including 60 days of gestation. After the first 30 days of treatment, mating was done by placing one non-treated male into cages containing six treated females. At the end of the treatment, data were collected on reproductive characteristics, serum metabolites, and oxidative stress markers. The results revealed that the ethanolic extract of D. glomerata induced a significant decrease in the number of post-implantation resorption and ovaries weight. Groups 3 and 4 showed a significant increase in the number of fetuses per dam and viable fetuses as well as placenta weight, compared to the control group. The serum level of progesterone significantly decreased in the group treated with 200 mg/kg D. Glomerata, compared to the other treated groups. The extract at 100 mg/kg body weight showed a significant increase in fetuses weight and fetuses crown-rump length, compared to the control group. Catalase activity significantly increased in the control group than D. glomerata treated groups. In conclusion, ethanolic extract of D. glomerata minimized reproductive stress and subsequently improved the reproductive performance of guinea pigs.

International Journal of Biological and Chemical Sciences, 2021

Dans le but de contribuer à une meilleure connaissance des effets des feuilles de goyavier sur la... more Dans le but de contribuer à une meilleure connaissance des effets des feuilles de goyavier sur la croissance en élevage porcin, une étude a été menée sur les effets de la supplémentation de l’aliment en poudre des feuilles de goyavier (Psiduim guajava) sur la croissance des porcelets hybrides (Large White x Landrace). A cet effet, 24 porcelets de 65 jours d’âge et de poids moyen de 10,83±0,26 kg ont été répartis en quatre lots de 6 porcelets (03 mâles et 03 femelles) chacun. A chaque lot choisi au hasard a été attribué par jour et pendant 30 jours consécutifs une ration supplémentée avec 0 ; 0,5 ; 1 et 1,5% de poudre des feuilles de goyavier. Les performances de croissance ont été étudiées. La consommation alimentaire et le poids vif ont été comparables entre tous les traitements. Le gain de poids, le gain moyen quotidien et l’efficacité alimentaire ont été significativement (P<0,05) plus élevés avec la ration contenant 1,5% de poudre de feuilles de goyavier comparé à la ration c...

Open access journal of veterinary science & research, 2019

International Journal of Biological and Chemical Sciences, May 15, 2009

Bulletin of animal health and production in Africa, Jun 26, 2008

International Journal of Poultry Science, Jun 15, 2019

HAL (Le Centre pour la Communication Scientifique Directe), 2020

International Journal of Zoology

Bulletin of animal health and production in Africa, 2007

IOSR Journal of Agriculture and Veterinary Science, 2020

Genetics and biodiversity journal, Jan 25, 2021

World's veterinary journal, Mar 25, 2021

GABJ

Open Journal of Animal Sciences

World's veterinary journal, Mar 25, 2021

International Journal of Biological and Chemical Sciences, 2021