Factors affecting calving interval and service period in Holstein friesian X Sahiwal crossbred cows
1999
Rafique, M. (Livestock Production Research Inst., Bahadurnagar (Pakistan)) | Chohan, K.R. | Amer, M.A.
The data on 1491 breeding records of service period and calving interval of different grades of H. Friesian x Sahiwal 75, 62.5, 37.5, 25 % and 1/2 (F1, F2, F3, F4) crossbred over a period of 19 years (1976-1994) were utilized. The overall average least square means and SE for service period and calving interval were 137.4 plus-minus 6.82 and 419.78 plus-minus 6.04 days, respectively. Both traits were significantly (P0.01) influenced by year, season and parity of calving, while the year x season interaction had non- significant effect on both-traits. The Spring season carvers and older cows were having shorter service period and calving interval.
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por National Agricultural Research Centre