SANAD, S., AFIFY, A. (2016). COMPARING GENETIC PARAMETERS OF FRIESIAN MILK PRODUCTION TRAITS IN COMMERCIAL AND STATE FARMS IN EGYPT. Egyptian Journal of Agricultural Research, 94(4), 971-984. doi: 10.21608/ejar.2016.153237
SAFAA SANAD; AHMED A. AFIFY. "COMPARING GENETIC PARAMETERS OF FRIESIAN MILK PRODUCTION TRAITS IN COMMERCIAL AND STATE FARMS IN EGYPT". Egyptian Journal of Agricultural Research, 94, 4, 2016, 971-984. doi: 10.21608/ejar.2016.153237
SANAD, S., AFIFY, A. (2016). 'COMPARING GENETIC PARAMETERS OF FRIESIAN MILK PRODUCTION TRAITS IN COMMERCIAL AND STATE FARMS IN EGYPT', Egyptian Journal of Agricultural Research, 94(4), pp. 971-984. doi: 10.21608/ejar.2016.153237
SANAD, S., AFIFY, A. COMPARING GENETIC PARAMETERS OF FRIESIAN MILK PRODUCTION TRAITS IN COMMERCIAL AND STATE FARMS IN EGYPT. Egyptian Journal of Agricultural Research, 2016; 94(4): 971-984. doi: 10.21608/ejar.2016.153237
COMPARING GENETIC PARAMETERS OF FRIESIAN MILK PRODUCTION TRAITS IN COMMERCIAL AND STATE FARMS IN EGYPT
Animal production research Institute – Ministry of Agriculture, Cairo, Egypt
Abstract
This study was conducted to estimate the genetic parameters for milk production traits of Friesian cattle in two selected dairy farms located in the Nile Delta of Egypt. A total of 1438 lactation records during the years2001 to 2009 were collected to represent 472 cows in Sakha Governmentfarm (SF). In comparison, a total of 1660 lactation records during the years 1998 to 2005 were collected to represent 465 cows in Gharbawy commercial (GF) farm. The derivative-free restricted maximum likelihood (REML) procedure was used to determine heritability, genetic correlation and breeding value of the studied traits. The results indicated that non genetic factors affecting lactation period (LP), total milk yield (TMY) and 305d -milk yield (305 d-MY) had highly significant (p < 0.001) effect on those traits except the effect of season of calving on TMY. Interaction between (herd & parity) and the interaction between (herd & parity & season) had highly significant effect (P< 0.001) on all milk production traits. The overall means of LP, TMY and 305-dMY were 313day; 4140kg; 3630 kg, respectively for cows in SF and as the corresponding values in GFwere 369.5day,8820Kg and 7430 kg. Estimates of direct heritability for LP, TMY, and 305MY in SF were 0.10, 0.11and 0.19 respectively, the corresponding estimates for GF were 0.10, 0.13 and 0.07 respectively on the other hand, estimates of maternal heritability for LP,TMY and 305MY in SF were 0.04, 0.07 and 0.06, respectively, while , the estimate in GF were 0.08, 0.09 and 0.12, respectively. The breeding values of sires estimated for LP,TMY and 305d-MY were 50.4, 27.4 and 42.3, respectively in SF, while the same estimates in GF were150.1, 20.04,and 30.7. The breeding values of cow concerning LP, TMY and 305MY in SF were 63.32, 45,4 and 21.5 while in GF, values were 195.1 , 29.9 , 53.2 , respectively . It can be concluded that improving environmental conditions and management practices, coupled with improved genetic potential of dairy animals in the state or commercial farms would be more effective approaches for high milk productivity.
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