Environmental factors and ram influence litter size, birth, and weaning weight in Saint Croix hair sheep under semi-arid conditions in Mexico

Tropical Animal Health and Production
Fernando Sánchez-DávilaRogelio A Ledezma-Torres

Abstract

This study was conducted to evaluate the effects of season, year of lambing, parity, and the effect of ram on litter size, birth, and weaning weight through 8 years. Data of 4078 lambs sired by 21 rams and 1072 ewes were analyzed by a lineal model. There was a significant effect (P < 0.05) of lambing number on litter size and birth weight, but not on weaning weight (P > 0.05). For litter size, the lowest numbers were obtained on the first lambing ewes (1.21 ± 0.03) and the highest ones inewes starting from the fourth lambing (1.69 ± 0.04). Lowest body weights were found in lambs born from first lambing ewes (3.01 ± 0.1 kg) and the highest ones in lambs born from the second (3.14 ± 0.1) to the fifth (3.15 ± 0.2) lambing ewes. The lambing breeding season had a significant effect on weaning weight: the highest weaning weights were recorded in lambs born in spring (12.70 ± 0.20 kg) and the lowest ones in those born in summer (11.93 ± 0.20 kg). Lambing year had a significant effect (P < 0.05) on litter size and weaning weight, since the values of both traits improved through the years. Effect of ram was significant (P < 0.05) for each of the traits considered: there were differences up to one lamb per litter, also differences up to ...Continue Reading

References

May 1, 1997·Animal Reproduction Science·R W GodfreyJ R Collins
Nov 13, 2004·Reproduction, Nutrition, Development·Maurice MahieuPhilippe Chemineau
Dec 21, 2006·Journal of Animal Science·H B VanimisettiL A Kuehn
Jan 13, 2011·Tropical Animal Health and Production·Fernando Sánchez DávilaRodolfo Ungerfeld
Apr 29, 2011·Tropical Animal Health and Production·Moutaz Zarkawi
Jun 15, 2013·Tropical Animal Health and Production·Juan Gabriel Magaña-MonforteJose Candelario Segura-Correa

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Citations

May 27, 2020·Tropical Animal Health and Production·Erick KandiwaBorden Mushonga
Apr 25, 2021·Tropical Animal Health and Production·A Abd El-Halim HebaA S Khattab

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