Mansoura Veterinary Medical Journal

EVALUATION OF NON GENETIC FACTORS AFFECTING MILK PRODUCTION TRAITS OF HOLSTEIN CATTLE

M Fouda,, Department of Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Mansoura University, Egypt
Kh El- Bayomi, Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Egypt
R Darwish, Department of Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Mansoura University, Egypt
A Eltanahy, Department of Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Mansoura University, Egypt

Corresponding Author

Eltanahy, A

Document Type

Original Article

Subject Areas

Animal welfare

Keywords

traits, cattle, factors

Abstract

This study was carried out to evaluate the effects of a ge at calving (AC), parity, days in milk (DIM), calving interval (CI), d ays open (DO), d ry period (DP), number of services per conception (NSC), s eason of calving on peak milk yield (PMY), time to attain peak milk yield (TPMY), 305 day mature equivalent (305- DMY) and total milk yield (TMY). Age at calving had significant effect (P≤ 0.05) on all traits studied except TPMY. DIM had a highly significant effect (P< 0.001) on PMY (37.14- 39.18 kg), TPMY (99.29- 194.08days), 305-DMY (8692.86 - 9760.65 kg) and TMY (4552.82- 12416.95 kg) respectively. Furthermore, DO and DP had a highly significant effect on PMY (33.72- 40.29 and 31.81 41.08 kg, respectively), TPMY (152.01- 165.14 and 139-165 day s , respectively), 305-DMY (8613.83- 9606.83 and 7266.76- 9699.76 kg, respectively) and TMY (8057.51- 8865.18 and 6682.97- 8850.30 kg, respectively). NSC had a highly significant effect (P< 0.001) on all traits studied except PMY. On the other hand, parity had no significant influence (P ≥ 0.05) on all traits studied except PMY. CI had no significant effect on all traits studied except 305-DMY. Moreover, season of calving had no significant effect on all traits studied. In conclusion, these factors should be accounted for genetic evaluation process. At farm level, management decisions such as selection and culling, and feeding should made putting these factors into consideration in order to achieve more reliable evaluation.

How to Cite This Article

Fouda,, M; El- Bayomi, Kh; Darwish, R; and Eltanahy, A (2017) "EVALUATION OF NON GENETIC FACTORS AFFECTING MILK PRODUCTION TRAITS OF HOLSTEIN CATTLE," Mansoura Veterinary Medical Journal: Vol. 18: Iss. 1, Article 10.
DOI: https://doi.org/10.21608/mvmj.2017.126437