Productive and reproductive performance and their interaction in crossbred cattle under field conditions in district Bannu [Pakistan]
2000
Qureshi, M.S. (Veterinary Research Inst., Peshawar (Pakistan)) | Khan, A. | Mirbahar, K.B. | Samo, M.U.
A study was conducted in district Bannu located in the southern dry piedmont mountains of the NWF Province of Pakistan. Records of 300 crossbred cows, produced through use of Holstein Friesian semen in native, non-discript cows, were studies. Data on various productive and reproductive parameters were analyzed. The average age at puberty was 752 plus minus 10.9 days, ranging from 420 to 1620 days and was positively correlated with mounting (r = 0.14) and negatively with estrus duration, vaginal mucus and calving interval (r = -0.14, -0.13, -0.15, respectively; P less than 0.05). the average inter-estrus interval was 20.0 plus minus 9.07 days, ranging from 15 to 24 days. Estrus duration was 34.0 plus minus 0.85 hours, ranging from 17 to 72 hours and was positively correlated with vaginal mucus (r = 0.12) and services per conception (r = 0.14) and negative with bellowing ( r = 0.11), P less than 0.05) number of services per conception in the crossbred cows averaged 1.6 plus minus 0.1 ranging from 1 to 12 and was correlated positively, with daily milk yield and negatively with lactation length and vaginal mucus (r = 0.32. -0.31, -0.27 respectively, P less than 0.01). calving interval was 612 plus minus 4.56 days, ranging from 360 to 900 days and was negatively correlated with age at puberty, daily milk yield and use of oxytocin (r = -0.15. - 0.67, -0.62, respectively, P less than 0.0)). The average lactation length of the cows was 503 plus minus 6.36 days, ranging from 30 to 1441 days. The mean daily milk yield was 10.1 plus minus 0.14 Kg, ranging from 1.0 to 18.0 Kg. The standard deviation (SD) for average daily milk yield was 2.36 Kg. Number of animals 1 SD above mean was 28.0% and those 2 SD above mean was 17.0%, number of animals 1 SD below mean was 51.4% and those 2 SD below mean was 3.6%, the wide variation makes a good base for productivity enhancement through selective breeding. It may be concluded that productive and reproductive performance is satisfactory in crossbred cattle under field conditions showing their adaptability to the local environment.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
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