Selection for nutrients by pregnant goats on a microphyll desert scrub

Mellado, Miguel; Aguilar, Cristóbal N.; Arévalo, José Ramón; Rodríguez, A.; García, José Eduardo; Mellado, Jesús

doi:10.1017/s1751731110002715

Cited by 11 publications

(4 citation statements)

References 75 publications

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“…Therefore, when feed supply to the fetuses reduces, the birth weight of kids also reduces. The result of this study supports the hypothesis that regardless of parity, litter weight in lactating goats increased at a reduced rate with an increase in litter size (Mellado et al, 2011). This study is consistent with a study conducted on black Bengal goats by Paul et al (2014), where the result showed that birth weight of kids was significantly affected by litter size (p<0.01).…”

Section: Discussionsupporting

confidence: 91%

Reproductive Efficiencies and Productive Potentials of Female Nigerian Indigenous Goat Breeds

Bitrus,

Ezema,

Makun

et al. 2023

AHJ

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Purpose: The overall objective of this study was to examine the reproductive and productive abilities of three Nigerian indigenous goat breeds. Methodology: The study covered 108 primiparous does and nine bucks from Sahel (SH), Red Sokoto (RS), and West African dwarf (WAD) goat breeds. In different pens, the animals were bred in various combinations: RS x RS, WAD x WAD, SH x SH, RS x SH, RS x WAD, SH x RS, and SH x WAD. WAD x SH, WAD x RS. Estrus synchronization was done using prostaglandins. Mating occurred naturally when animals were on heat. Dams were given special care throughout pregnancy. The study measured dams' weights, litter size, and pre-weaning mortality rates in kids. The total kid crop and sexes were also assessed. We measured dam lactation weight loss, birth weight, and weaning weight. SPSS, ANOVA, and the Turkey statistical test were used for data analysis. Findings: The result showed that there was a significant (P<0.05) difference in the weight of does at kidding. The weight of does at weaning varied significantly (P<0.05). Litter size significantly (P<0.05) affected the birth weight and weaning weight of kids. An increase in litter size per birth resulted in a significant (P<0.05) rise in kid mortality rates. Breed type significantly (P<0.05) affected doe production efficiency and weaning weight ratio. Although WAD x WAD goats had lower birth and weaning weights, hybrid vigour (birth and weaning weights) improved significantly (P<0.05) when cross-bred with SH or RS breeds. When crossed with SH or WAD goat breeds, RS breeds had the greatest positive effect on hybrid vigour (heterosis), followed by SH breeds. Both SH x RS and RS x SH progenies recorded higher hybrid vigour than the other nine bred line progenies. Unique contribution to theory, practice and policy: This study found that Nigerian indigenous goat breeds had great reproductive efficiency and breeding potential if properly managed. Genetic variations observed in the study could improve Kids crop, birth weight, litter size, hybrid vigour, and pre-weaning survivorship due to their broad variety. This study recommends a careful selection and crossbreeding of Nigerian indigenous goat breeds with suitable pedigree in order to increase their productivity.

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Section: Discussionsupporting

confidence: 91%

Reproductive Efficiencies and Productive Potentials of Female Nigerian Indigenous Goat Breeds

Bitrus,

Ezema,

Makun

et al. 2023

AHJ

View full text Add to dashboard Cite

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“…Studies commonly found that herbivores preferentially select plant species relatively high in nutrients 16 . However, it was not the case with L. chinensis , as it had a higher CP content than C. squarrosa and C. duriuscula but the lambs with longer access time at pasture did not focus their grazing on it, even when nutrient levels were highest in July.…”

Section: Discussionmentioning

confidence: 99%

Diet selection and n-3 polyunsaturated fatty acid deposition in lambs as affected by restricted time at pasture

Zhang

Jin

Badgery

et al. 2017

Sci Rep

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This study investigates the effects of restricted grazing time on forage selectivity and meat fatty acid deposition of lambs compared to a traditional grazing system. Results showed that the animals preferred to graze pasture species that were more palatable and lower in fibre, while demonstrating a partial preference for species with high protein levels. Leymus chinensis was more preferentially selected by lambs grazing pasture for shorter periods than longer periods. Lambs that grazed for 4 h per day had a high LNA (α-linolenic acid) intake. The accumulation of LNA and its elongation products in tissue was closely related to the LNA level in diet. Therefore, allowing lambs to graze for at least 4 h per day resulted in a meat fatty acid profile that is richer in health-promoting fatty acids. In particular, the highest DHA (docosahexaenoic acid) was observed in meat from lambs which grazed pasture for 4-h versus 8- and 12-h. It can be concluded that, in grassland systems, a healthier meat fatty acid profile for humans and the potential for better pasture management is achieved by limiting the grazing of lambs to 4 h per day rather than grazing over longer time periods.

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“…This perennial xerophytic species was chosen by the goats, regardless of its cover and season of the year. This plant can account for up to 15% of the diet (Mellado et al, 2011). The resistance of Larrea tridentata to drought -along with its moderate levels of protein (104-117 g kg 1 DM; Table 1) and its continuous metabolic activity under extreme drought conditions (Allen et al, 2008)seems to be the attribute that makes it appealing to goats.…”

Section: Resultsmentioning

confidence: 99%

Selection and chemical composition of plant species consumed by goats under drought conditions in three microregions of the Comarca Lagunera, Mexico

Arenas-Báez,

Maldonado-Jáquez,

Garay-Martínez

et al. 2024

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Objective: To evaluate the plant selection of the diet of goats during the dry season and the chemical composition of the said plants in three microregions of the Comarca Lagunera, Mexico. Design/Methodology/Approach: Three microregions were identified within the Comarca Lagunera: 1) mountain slope, 2) plain, and 3) cultivation areas. The selection of the goat diet, the availability of forage, and the nutritional composition (CP, EE, DNF, AFD, NFC, TDN, and NEl) of plant species and strata were evaluated in the three microregions. Results: The shrubs and herbaceous in the Comarca Lagunera had the highest forage availability and a better nutritional profile during winter. On the one hand, these plant strata had an adequate protein content. On the other hand, the overall energy content reached <1 Mcal kg-1 DM. Study Limitations/Implications: The plant strata have an adequate protein content; however, the energy content is not enough and limits growth. Consequently, supplementation programs for grazing dairy goats in the Comarca Lagunera must include sources of energy. Findings/Conclusions: Regardless of the microregion, the energy content of the species consumed by grazing dairy goats in the Comarca Lagunera is low.

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Selection for nutrients by pregnant goats on a microphyll desert scrub

Cited by 11 publications

References 75 publications

Reproductive Efficiencies and Productive Potentials of Female Nigerian Indigenous Goat Breeds

Reproductive Efficiencies and Productive Potentials of Female Nigerian Indigenous Goat Breeds

Diet selection and n-3 polyunsaturated fatty acid deposition in lambs as affected by restricted time at pasture

Selection and chemical composition of plant species consumed by goats under drought conditions in three microregions of the Comarca Lagunera, Mexico

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