Effect of mating frequency and weaning-to-mating interval on sow reproductive performance
نویسندگان
چکیده
Methods: Reproductive data were collected from 20 Minnesota and Iowa breeding herds, covering a 7-year period from January 1, 1986–December 31, 1992. Natural mating was used in all herds during the study period. Females bred one, two, or three times during a single estrus were included in the study to compare fertility rates (conception rate, farrowing rate, and adjusted farrowing rate) and litter size between mating frequency. Previous weaning-to-mating intervals were also used to investigate possible interactions with MF on subsequent fertility rates and litter size.
منابع مشابه
برآورد عملکرد و بررسی تاثیر برخی از عوامل محیطی موثر بر صفات تولید مثلی در گوسفندان نژاد بختیاری
In this study 2510 records of reproductive traits from the mating of 879 ewes with 164 rams of Bakhtiari sheep breed, during 1989 to 1997, were used in order to estimate the effects of environmental factors on their reproductive performance. The mean and standard errors of reproductive traits were as follows: conception rate, 0.9±0.01 number of lambs born per ewe exposed, 1.06±0.01 number of la...
متن کاملبرآورد عملکرد و بررسی تاثیر برخی از عوامل محیطی موثر بر صفات تولید مثلی در گوسفندان نژاد بختیاری
In this study 2510 records of reproductive traits from the mating of 879 ewes with 164 rams of Bakhtiari sheep breed, during 1989 to 1997, were used in order to estimate the effects of environmental factors on their reproductive performance. The mean and standard errors of reproductive traits were as follows: conception rate, 0.9±0.01 number of lambs born per ewe exposed, 1.06±0.01 number of la...
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تاریخ انتشار 1997