GENETIC AND NON-GENETIC FACTORS AFFECTING MONTHLY AND CUMULATIVE MONTHLY MILK YIELD IN EGYPTIAN BUFFALOES | ||||
| Journal of Animal and Poultry Production | ||||
| Article 3, Volume 26, Issue 9, September 2001, Page 5251-5260 PDF (887.85 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2001.257961 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| O. M. B. El Shafie, | ||||
| Animal production Research Institute, Dokki, Cairo, Egypt | ||||
| Abstract | ||||
| Total of 893 lactation records collected during the period (1983-1993) on a herd of 281 buffaloes and 21 sires raised at Mehallet Mousa, Station, Animal Production Research Institute, Ministry of Agriculture, Egypt, were used to study some genetic and non-genetic factors affecting monthly and cumulative monthly milk yield. Effects of sire, generation number, year of calving and parity were highly significant for most of the traits studied except season of calving which was not significant. Heritability estimates of all traits were low and positive, they ranged between 0.06 to 0.19. Estimates of genetic correlation between each of monthly milk yield at the 3 rd and the 4 th month and cumulative monthly milk yield at 90 and 120 days and 300 days milk yield were positive and high about 1.02-1.09. Also, phenotypic and environmental correlation between the traits studied and 300 days milk yield were positive and either moderate or high, ranging between 0.35 and 0.99. | ||||
| Keywords | ||||
| Egyptian buffaloes; monthly milk yield; cumulative monthly milk yield; sire effect; non-genetic factors; heritability; genetic and phenotypic correlations | ||||
|
Statistics Article View: 37 PDF Download: 124 |
||||
