Houari Yerou - Academia.edu (original) (raw)

Papers by Houari Yerou

Frontiers in Veterinary Science, Aug 16, 2023

Genetics and biodiversity journal, 2022

Sheep farming systems in the steppe of M' sila eastern Algeria play a key ro le in the red meat p... more Sheep farming systems in the steppe of M' sila eastern Algeria play a key ro le in the red meat productio n chain. The aim of this contribution is to assess the sustainability of sheep farms in relat ion to the current functioning of the breeding and to describe the strong and weak points limit ing imp rovement of productivity in a perspective of sustainability. The method of indicators of sustainability of farms (IDEA) was used to evaluate sustainability. The typological results allowed us to distinguish two main types of livestock farming, namely agro pastoral and pastoral, wh ich have different sustainability profiles. The agro pastoral type is characterized by sustainability scores of 69.4/ 100, 43.6/ 100 and 36.4/100 respectively for agro ecological, socio-territorial and econo mic sustainability. The pastoral type shows the same trend with superiority in the econ omic scale. The co mparison of the sustainability scales in relation to the type of livestock showed that the two livestock systems are significantly different for agro-ecological and socio-territorial scale (P<0.05) in contrast to the economic scale. Consequently, each type requires particular imp rovements, according to its functioning and the threshold of the scores realized at the level of the global sustainability in order to guarantee a profitability of the breeding at the level of the Algerian steppe region.

Revue D Ecologie-la Terre Et La Vie, 2013

rôLE dEs typEs d'éLEvagE dans La dégradatIon dEs FormatIons STEPPIQUES DANS LA RÉGION DE NAâMA (A... more rôLE dEs typEs d'éLEvagE dans La dégradatIon dEs FormatIons STEPPIQUES DANS LA RÉGION DE NAâMA (ALGÉRIE SUD-OCCIDENTALE) houari yerou 1 & Khéloufi benabDeli 1 summary.-Role of livestock practices in the degradation of steppe spaces in Naâma area (south-western Algeria).-Steppe spaces of the Naâma area are rather well representative of all steppe spaces of western Algeria. They are exploited as rangelands with a mean carrying capacity of 10 sheep / hectare although the possibilities are only of 0.9 ha / sheep. Traditional livestock systems as currently practiced overexploit and degrade all kinds of vegetation along the year. They constitute the main threat on the sustainability of plant formations. The impact of the even archaic practices of livestock occurring in Naâma area, as in all the steppe spaces of Algeria, result in a yearly average regression of the density of 278 tufts / hectare. concerning the total green biomass, we observe a mean annual reduction of 183 kg / ha. this impact is important and represents a serious short-term threat to the everlastingness of the steppe with Stipa tenacissima if no protective and rehabilitation measures are quickly undertaken. résumé.-Les formations végétales steppiques dans la région de Naâma, assez représentatives du sud-ouest oranais, sont soumises en permanence à un parcours ovin avec une charge pastorale moyenne de 10 ovins / hectare alors que les possibilités ne sont que de 0,9 ha / ovin. Cette surexploitation se traduit par une dégradation de la végétation et constitue la principale menace sur la pérennité des formations végétales. L'impact des pratiques d'élevage ne prenant pas en considération les possibilités de régénération des espèces palatables dans la zone de Naâma, comme dans tout l'espace steppique se traduit par une régression moyenne annuelle de la densité de l'alfa et du sparte de 278 touffes par hectare. Pour ce qui est de la biomasse verte totale, elle connaît une diminution moyenne annuelle de 183 kg par hectare. Cet impact est important et menace à court terme la pérennité des formations steppiques si aucune mesure de protection et de réhabilitation n'est entreprise rapidement.

Selcuk journal of agriculture and food sciences, Apr 24, 2023

HIGHLIGHTS • Most dairy farmers in Mostaganem province, Algeria feed their cows a basic ration of... more HIGHLIGHTS • Most dairy farmers in Mostaganem province, Algeria feed their cows a basic ration of oat hay and straw, while only 32% use corn silage. • Mastitis was the most common disease reported by farmers, with a culling rate of 23%, highlighting the need for improved herd health management practices.

GENETICS AND BIODIVERSITY JOURNAL (GABJ), Jun 15, 2021

The dairy cattle husbandry systems in semi arid climate require adapting as a response to climate... more The dairy cattle husbandry systems in semi arid climate require adapting as a response to climate change. In this study, we focus on semi arid climate of Mediterranean region to assess the effect of heat stress on productive and physiological parameters of Holstein cows. The temperature-humidity index (THI), calculated as a combination of ambient temperature and relative humidity, was used to characterize heat stress. The averages of index (THI) are 71.7, 83.6 and 72.6 respectively for spring; summer and autumn. when the THI increased from average value 12 unit between spring and summer, the cows decreased their daily milk production (DMP) and dry matter intake (DMI) by 17.6 % kg/day and 22 % respectevelly.THI value was negatively correlated to DMP with regression equation DMP (kg /day) =-0,36THI+40.8 (r2 =0.72). in semi arid condition a daily increase was observed for RT, RR an HR respectively when the THI value increased from 71.7 to 83.6 (RT 38.6˚C to 39.1˚C; RR 49.3 inspiration/min to 71.6 inspiration/min and HR 52.6beat/min to 72.7 beat/min for spring and summer respectively) with positive correlation between THI and RR, HR and RT. significant seasonal variation was detected for all physiological parameters for spring, summer and autumn period. Summer heat stress affected the physiological functions of lactating Holstein cows reared under semi arid Mediterranean climatic conditions. The Holstein breed cows are sensitive to heat stress in semi arid conditions. In the context of cow breeding practiced in conditions of semi-arid heat stress, it is necessary to find alternatives in terms of management or genetic improvement, in order to alleviate the impact of climatic stress on performance and physiological parameters.

Genetics and biodiversity journal, Jul 1, 2022

This research aimed to evaluate the effect of the epigenetic climatic factor of heat stress expre... more This research aimed to evaluate the effect of the epigenetic climatic factor of heat stress expressed by the THI on some parameters of milk production of Prim'Holsteins cows kept in the climate of the Algerian West coast. The THI was used as an indicator of the heat stress threshold. A sample of 75 lactating cows was divided into three groups according to THI level. The cows of group 1, with severe stress (THI>78), those of group 2, with light stress (THI 72-78), and those of group 3 in thermal comfort (THI<72). The daily milk production (DMY), the Physico-chemical quality (TB, TP, and EST), and the hygienic quality (total flora FMAT) of raw milk showed a decrease with the increase of the THI threshold. A significant effect (p<0.05) of heat stress is recorded on the Physico-chemical and microbiological parameters of milk. The FMAT count values of raw milk samples were highest for groups 1 and 2, while a low bacterial load was recorded for group 3 (THI<72). Heat stress had a negative impact on the performance of Prim'Holsteins cows. These preliminary results show the severity of the negative impact of heat stress in the littoral region on the production and the physicochemical and hygienic quality of milk and will serve as a useful guide for farmers to adopt actions to mitigate the impact within the barns for the sustainability of livestock.

Afrique Science: Revue Internationale des Sciences et Technologie, Sep 1, 2014

Le suivi du phénomène de désertification dans une zone steppique est assez sensible car fragilisé... more Le suivi du phénomène de désertification dans une zone steppique est assez sensible car fragilisée par les facteurs tant climatiques qu'anthropiques entrepris reposant sur deux méthodes. La première est axée sur une investigation basée sur une enquête effectuée auprès d'un échantillon représentatif d'éleveurs et de collecte de données socio-économiques. La deuxième méthode repose sur l'utilisation de la télédétection comme outil rapide d'investigation et de suivi du phénomène de désertification. Le constat est sans appel, d'après les observations faites sur le terrain, les déclarations des populations locales et l'exploitation des images satellitaires, les formations végétales régressent au profit de l'ensablement. Parmi les causes principales de la désertification, la croissance démographique, la sédentarisation des populations nomades et semi-nomade et l'exploitation excessive des ressources naturelles. Ainsi, la cartographie et le traitement de l'image satellitaire Landsat de 2007 confortés par des sorties de vérification sur le terrain et des entretiens avec la population locale ont permis de cartographier la carte dynamique de l'occupation du sol. Les résultats obtenus sont assez significatifs, les formations à Artemisia herba alba sont en voie de disparition, alors que le groupement à Stipa tenacissima ne couvre que 4,63 % du total de la zone d'étude. Le paysage est occupé par de nouvelles steppes issues de dégradation où dominent Salsola vermiculata, Atractylis serratuloides, Noaea mucronata, Peganum harmala. Les formations psammophytes à Retama raetam, Thymelaea microphylla et Tamarix africana, s'étendent sur plus de 17 %. L'ensablement menace ces formations déjà fragilisées et il couvre plus de 4 % de la superficie.

HAL (Le Centre pour la Communication Scientifique Directe), 2013

Biotechnology in Animal Husbandry, 2018

The data base for body weights and growths of 411 Hamra lambs were used to estimate genetic param... more The data base for body weights and growths of 411 Hamra lambs were used to estimate genetic parameters. These lambs were obtained from 31 rams and 493 ewes between 2012 and 2017. Traits analysed were weights at birth (B W), 30 days (W 30), 90 days (W 90) of age, and average daily gains from 10 to 30 (ADG 10-30) and30-90 (ADG 30-90) days. REML estimates of variance and covariance components were obtained assuming animal models that included the fixed effects for year-type of birth (2012 single, 2012 twin,. ., 2017 single, 2017 twin), sex (male, female), and ewes age at lambing (< 18, 18-30, 30-42, 42-54, >54 months). Heritabilities were 0.12, 0.06 and 0.11 respectively for B W , W 3O and W 90 and the average daily gains were 0.05 and 0.17 for ADG 0-30 and ADG 30-90. The estimates of genetic correlations showed no genetic antagonisms among the growth traits. The genetic correlations estimated were positive and medium to high, except those between ADG 30-90 and ADG 0-30 and between ADG 30-90 and W 30 which were slightly negative. Phenotypic correlations were positive and ranged from 0.12 to 0.85. They were high between adjacent weights and between ADG and their corresponding weights.

Biotechnology in Animal Husbandry, 2021

Water resources are becoming scarce and must be preserved. The significant use of water is linked... more Water resources are becoming scarce and must be preserved. The significant use of water is linked to agriculture in general and to livestock in particular. Very little research in semi-arid regions has been devoted to assessing the contribution of ruminants to water scarcity. This contribution explores the relationships between dairy farming and the various water resources available in an ecosystem with climatic constraints. To meet future food demand while sustainably managing the available land and water resources, dairy farm systems in semi-arid regions must adapt in response to climate and socioeconomic change. In this study, we focus on the south Mediterranean region to analyze the key factors influencing water productivity in dairy farming, especially in context characterized by water scarcity. In order to characterize the relationship between dairy cattle breeding and water resources, a monitoring of 40 dairy cattle stables has been carried out in a semi-arid region. The technical and economic parameters of each farm were evaluated: the use of water according to their origins to the production of fodder by source, the contribution of virtual water off the farm, the total fodder biomass, feeding system practiced on the farms and the performances achieved. Analysis of the data indicates that productivity of fodder in dry matter differ between the two systems with values of the order of 12520 to 17188 kg/ha (p<0.05) respectively for type extensive and intensive systems. The milk yield per cow did not exceed an average value of 3680 kg (rang 3240 to 4120 kg. The mean gross margin per kilogram of milk was low, not exceeding 0.13€. A significant effect (p<0.05) of the value of the water footprint between the two dairy farm systems with an average of around 2.05m 3 /kg of milk (range 1.96 to 2.15 respectively for intensive and extensive farms). The contribution of rainfall is estimated at 57% and the rest is represented by the participation of irrigation and virtual water with 18% and 25% respectively. Necessary actions must be taken along the milk production process in order to improve the productivity of water for Houari Yerou et al. 28 forage production and the milk which depends in large part on annual rainfall and to a lesser extent on groundwater.

Selcuk Journal of Agricultural and Food Sciences

A survey was conducted to evaluate husbandry practices and herd health management in dairy farms ... more A survey was conducted to evaluate husbandry practices and herd health management in dairy farms in Mostaganem province, located in north Algeria. Data was collected through face-to-face interviews with 56 farmers, followed by a visit to the production environment of the dairy cows. The results showed that 64% of farmers feed their cows a basic ration of oat hay and straw, while 32% use corn silage. On average, 9.85 ±0.32 kg of concentrate was distributed per dairy cow. Most farms didn’t have efficient forage production, while only 21% of them produced all the necessary forage. The average milk production per cow on the surveyed farms was 18.19 ±0.45 L, with a lactation length of 293.5 ±1.65 days. The cows were milked using a portable milking machine in poor hygienic conditions. Estrus detection was performed occasionally by farmers, and natural breeding was the main method of insemination, occurring at a rate of 63%. The voluntary waiting period was on average 76.6 ±3.56 days, and ...

Genetics & Biodiversity Journal

GABJ

Sheep farming systems in the steppe of M'sila eastern Algeria play a key role in the red meat... more Sheep farming systems in the steppe of M'sila eastern Algeria play a key role in the red meat production chain. The aim of this contribution is to assess the sustainability of sheep farms in relation to the current functioning of the breeding and to describe the strong and weak points limiting improvement of productivity in a perspective of sustainability. The method of indicators of sustainability of farms (IDEA) was used to evaluate sustainability. The typological results allowed us to distinguish two main types of livestock farming, namely agro pastoral and pastoral, which have different sustainability profiles. The agro pastoral type is characterized by sustainability scores of 69.4/100, 43.6/100 and 36.4/100 respectively for agro ecological, socio-territorial and economic sustainability. The pastoral type shows the same trend with superiority in the economic scale. The comparison of the sustainability scales in relation to the type of livestock showed that the two livestock...

Biotechnology in Animal Husbandry, 2021

Les formations vegetales steppiques dans la region de Naâma, assez representatives du sud-ouest o... more Les formations vegetales steppiques dans la region de Naâma, assez representatives du sud-ouest oranais, sont soumises en permanence a un parcours ovin avec une charge pastorale moyenne de 10 ovins / hectare alors que les possibilites ne sont que de 0,9 ha / ovin. Cette surexploitation se traduit par une degradation de la vegetation et constitue la principale menace sur la perennite des formations vegetales. L'impact des pratiques d'elevage ne prenant pas en consideration les possibilites de regeneration des especes palatables dans la zone de Naâma, comme dans tout l'espace steppique se traduit par une regression moyenne annuelle de la densite de l'alfa et du sparte de 278 touffes par hectare. Pour ce qui est de la biomasse verte totale, elle connait une diminution moyenne annuelle de 183 kg par hectare. Cet impact est important et menace a court terme la perennite des formations steppiques si aucune mesure de protection et de rehabilitation n'est entreprise rapi...

Le suivi du phenomene de desertification dans une zone steppique est assez sensible car fragilise... more Le suivi du phenomene de desertification dans une zone steppique est assez sensible car fragilisee par les facteurs tant climatiques qu’anthropiques entrepris reposant sur deux methodes. La premiere est axee sur une investigation basee sur une enquete effectuee aupres d'un echantillon representatif d’eleveurs et de collecte de donnees socio-economiques. La deuxieme methode repose sur l’utilisation de la teledetection comme outil rapide d'investigation et de suivi du phenomene de desertification. Le constat est sans appel, d'apres les observations faites sur le terrain, les declarations des populations locales et l’exploitation des images satellitaires, les formations vegetales regressent au profit de l’ensablement. Parmi les causes principales de la desertification, la croissance demographique, la sedentarisation des populations nomades et semi-nomade et l’exploitation excessive des ressources naturelles. Ainsi, la cartographie et le traitement de l’image satellitaire La...

Frontiers in Veterinary Science, Aug 16, 2023

Genetics and biodiversity journal, 2022

Revue D Ecologie-la Terre Et La Vie, 2013

Selcuk journal of agriculture and food sciences, Apr 24, 2023

GENETICS AND BIODIVERSITY JOURNAL (GABJ), Jun 15, 2021

Genetics and biodiversity journal, Jul 1, 2022

Afrique Science: Revue Internationale des Sciences et Technologie, Sep 1, 2014

HAL (Le Centre pour la Communication Scientifique Directe), 2013

Biotechnology in Animal Husbandry, 2018

Biotechnology in Animal Husbandry, 2021

Selcuk Journal of Agricultural and Food Sciences

Genetics & Biodiversity Journal

GABJ

Biotechnology in Animal Husbandry, 2021