Preference Indices for Forage Species Grazed by Spanish Goats on a Semiarid Shrubland in México (original) (raw)
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Forage intake and nutrition of range goats in a shrubland in northeastern Mexico
Journal of Animal Science
1991, 69:879-885. J ANIM SCI http://jas.fass.org/content/69/3/879 the World Wide Web at: The online version of this article, along with updated information and services, is located on www.asas.org by guest on ABSTRACT Voluntary intake and nutritive value of diets selected by goats grazing a shrubland at Marin county, N.L., Mexico were determined. Four esophageally cannulated Spanish female goats (average BW 35 kg), were used to collect extrusa samples monthly throughout 1 yr (June 1987 to May 1988). Organic matter intake (OM) was estimated by total fecal collections from four castrated Spanish male goats (average BW 42 kg). Diets selected by goats were high in CP throughout the year (Z = 18.9%). Available CP represented only about half the total CP. The ADF content of extrusa samples differed (P < .05) among months, with high ADF values during winter months. Dietary lignin followed a similar pattern during the year. Goats consumed forage with sufficient amounts of Ca, Na, K, Mg, Cu, ZN, Mn, and Fe to meet requirements. The OMI of goats was different (P < .05) among sampling periods. On the average, estimated OMI 6 = 878.7 g/d) compared well with results of other studies in the area. Amounts of DE consumed by goats (1.1 Mcal DE/d)
forraje nutrition of range goats.pdf
Forage intake and nutrition of range goats in a shrubland in northeastern Mexico 1991. 69:879-885. J Anim Sci http://jas.fass.org the World Wide Web at: The online version of this article, along with updated information and services, is located on www.asas.org ABSTRACT Voluntary intake and nutritive value of diets selected by goats grazing a shrubland at Marin county, N.L., Mexico were determined. Four esophageally cannulated Spanish female goats (average BW 35 kg), were used to collect extrusa samples monthly throughout 1 yr (June 1987 to May 1988). Organic matter intake (OM) was estimated by total fecal collections from four castrated Spanish male goats (average BW 42 kg). Diets selected by goats were high in CP throughout the year (Z = 18.9%). Available CP represented only about half the total CP. The ADF content of extrusa samples differed (P < .05) among months, with high ADF values during winter months. Dietary lignin followed a similar pattern during the year. Goats consumed forage with sufficient amounts of Ca, Na, K, Mg, Cu, ZN, Mn, and Fe to meet requirements. The OMI of goats was different (P < .05) among sampling periods. On the average, estimated OMI 6 = 878.7 g/d) compared well with results of other studies in the area. Amounts of DE consumed by goats (1.1 Mcal DE/d)
Nutritive value of browse plants selected by range goats in the Mexican plateau
Journal of Applied Animal Research, 2011
The study was conducted in the south-west Tlaxcala, Mexico. Two simultaneous trials were carried out in range goats, during dry and wet seasons, to determine the nutritive value of selected forages and dry matter intake (DMI) using Cr 2 O 3 . The crude protein (CP) content varied from 2.89 to 19.8 g/100 g, and acid detergent fiber (ADF) from 23.4 to 67.7 g/100 g. The highest CP content was in the plants Simpsia amplexicahuale and Senecio salignus. The ADF and ash contents increased in dry season (p B0.05). Conversely, dry matter digestibility (DMD) increased in wet season (p B0.05). DMI of goats was 98.1 and 90.3 g/kg LW 0.75 (p B0.01) for dry and wet season, respectively. In dry season protein requirements of goats were fulfilled only by S. salignus. In wet season, all evaluated plants covered the requirements of CP for maintenance. Simpsia amplexicahuale and Bouvardia ternifolia showed outstanding CP and DMD.
Age and body condition score and diets of grazing goats
Rangeland Ecology & Management, 2004
Diet selection by juvenile and adult non-pregnant, non-lactating goats and the diets of adult non-productive goats with low (< 1.5; grading scale 0-5) and moderate (≥ 2.5) body condition score (BCS) are described by microhistological analysis of fecal samples for a Chihuahuan desert vegetation in northern Mexico. In the rainy season, adult goats utilized more (P < 0.10) shrubs than juvenile goats (70.4 vs 58.6%), but, in the dry season, the diet of both groups contained equal amounts of shrubs. The proportion of forbs and grasses in the goats' diet also tended to vary (P < 0.10) between age groups in the rainy season. Juvenile goats generally had lower consumption of plants with spines than adult goats. Goats with low BCS selected more (P < 0.10) shrubs than goats with moderate BCS in the rainy season. Forbs were eaten in larger amounts by does with moderate BCS (38% of the diet) during the rainy season compared to goats with low BCS (30.9%).
World Journal of Agriculture and Soil Science
The goal of the study was to determine the nutritive values and in vitro true digestibility (IVTD) of browse and forb species consumed by goats at the Tuskegee University Atkins site. The site can be described as unmanaged long leaf pine plantation site approximately 10 years of age in the east, gulf coast region of Macon County, Alabama. The latitude of the Tuskegee site is 32.4230N and longitude is 85.6910W. The landscape is characterized by gently sloping topography (5-10 percent) and consist of many encroaching browse/forb species. The predominant grass cover is primarily of Andropogon virginicus (broom sedge) and other bunch grasses. These browse/forb species encompass much of the woodland vegetation in the Southeastern United States. Thirty different species were selected for analysis based on previous observations of goat preferences. Samples consisted of the leaves and tender tips collected three different times throughout the duration of the growing season (i.e. April (Spring), July (Summer), and November (Fall)). Samples were analyzed for crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), crude fat, and in vitro true digestibility (IVTD). The total digestible nutrients (TDN) values were estimated from ADF values. The average CP values were 19.0, 16.9, and 11.5% for spring, summer and fall collections, respectively. There were significant differences (P<0.001) between the spring values compared with summer and fall values, however, there were no differences (P>0.05) between the summer and the fall values. Similar trends were observed for ADF, NDF, TDN, and IVTD values, except the fat values were similar between the spring and the fall collections while being significantly different from the summer values (P<0.01). The results provided valuable information about the nutritive values and IVTD value of browse and forb species commonly consumed by meat goats in the woodland areas of Alabama. The experiment will be continued for two additional years to overcome the seasonal differences so meaningful results can be obtained.
Small Ruminant Research, 2006
The aim of this study was to determine seasonally the nutritive value and fermentability of diets selected by range goats in a thorn shrubland of North México. Esophageal cannulated goats were used to obtain extrusa samples. Samples were collected monthly from February 1999 to December 2000. Intact males fitted with harnesses were utilized for total fecal collection and DM intake determinations. Crude protein, ash and cell wall contents were determined. Macro (Na, Ca, P, Mg, K) and trace elements (Cu, Mn, Zn and Fe) were also estimated. In vitro gas production was performed to estimate rumen kinetics of goat diets. Statistical comparisons were made between seasons. The OM (mean = 84.3%), CP (13.5%), NDF (49.6%), ADF (37.5%) and lignin (12.0%) contents were different (P < 0.05) between periods. Dry matter intake ranged from 58.6 (summer) to 91.7 g kg 0.75 (winter). With exception of P, all minerals were different (P < 0.05) between seasons. Moreover, during all seasons, goats selected diets with sustained amounts of Na, Ca, Mg, K, Co, Zn and Fe. However, Cu and Mn appeared to be insufficient. Significant differences between seasons were obtained in the gas production parameters. Mean values for the gas produced from the insoluble but fermentable fraction b and the constant rate of gas production c were 33.0 ml/200 mg OM and 5.6% h −1 , respectively. Dietary CP was adequate to meet goat requirements in all seasons. However, a regime of Cu and Mn supplementation must be considered. Negative correlations between cell wall constituents and in vitro gas parameters may indicate the detrimental effect such compounds exert on gas production. Differences registered in cumulative gas production and fraction c permit to identify the differences of nutritive value of the diets selected by animals throughout seasons.
Small Ruminant Research, 1996
Nine local (Guyana, South America) cross-bred, intact, growing, male goats (6 months old with mean ( f SD) initial BW of 19.9 f 2.8 kg) were used in two metabolism trials. They were fed diets formulated to be iso-caloric with protein levels of 51, 76, 91, 108 and 127 g CP kg-' DM (Trial 1). Trial 2 goats were fed diets formulated to be iso-nitrogenous with energy density values of 7, 11, 12, and 14 MJ DE kg-' DM. Diets contained ground untreated sugarcane bagasse as the sole roughage source ranging from 253 to 540 g kg-' DM. Each diet was pelleted to minimise differences in physical form and to prevent sorting and selection. The overall mean DMI values (+ SD) for Trials 1 and 2 were 25.0 + 1.4 and 29.8 _+ 4.1 g kg-' BW, respectively. Trial 1 DMI showed a (P < 0.00 I) linear increase with N intake which accounted for 56% of the variation of DMI and an increase of 33.1 g per unit increase of N. Both OM and DE intake increased (P < 0.05) with increasing dietary protein levels. However, when diets of varying energy levels (Trial 2) were fed only DE intake increased (P < 0.05).
Grass and Forage Science, 2018
In a time when commercial and intensive animal production is considered a major cause of natural resource degradation and greenhouse gas emissions, smallholder goat-raising systems are well positioned to contribute to the provision of high-quality food protein for human consumption while reducing environmental impacts. This synergism could be achieved by optimizing the use of forage resources in rangelands (Dubeuf, Miller, Bhandari, Capote, & Luginbuhl, 2014). In Argentina, arid and semi-arid rangelands account for approximately two-thirds of its continental surface. One of these regions, the Monte Desert, is an extensive area of shrublands and open woodlands, comprising an area of about 467,000 km 2 of the driest rangeland of Argentina (Abraham et al., 2009). This region offers an important potential for goat production and consequently contributes 52% of the national goat inventory (Guevara et al., 2009). Throughout the different phases of their reproductive cycle, and during various seasons, female goats consume diets that differ in terms of plant parts,