Dry Period in Cattle: I. Influence on Milk Yield and Reproductive Performance

Authors : Jale METİN KIYICI, Özlem KÖKNUR, Mahmut KALİBER

Pages : 324-330

Doi:10.15832/ankutbd.512466

View : 17 | Download : 8

Publication Date : 2020-09-04

Article Type : Research Paper

Abstract :Purpose of this study was to investigate the relations of dry period lengths insert ignore into journalissuearticles values(DPL); with subsequent lactation insert ignore into journalissuearticles values(305-d); milk yield insert ignore into journalissuearticles values(MY); and reproductive performance of Holstein cattle. Data were obtained from 800 Holstein cows raised in a private dairy operation and which were in different parity insert ignore into journalissuearticles values(2nd, 3rd and ≥4th);. DPL was classified in 5 categories as; ≤40, 41-50, 51-60, 61-70 and ≥71 days. The differences in lactation milk yields of experimental DPL groups were not significant. The highest MY insert ignore into journalissuearticles values(7808.6±135.1 Lt); was obtained from ≥71 days DPL group and the lowest MY insert ignore into journalissuearticles values(7529.4±159.8 Lt); was obtained from ≤40 days DPL group. DPL had significant effect on the number of inseminations resulted in pregnancy insert ignore into journalissuearticles values(P<0.01);. The greatest pregnancy ratio insert ignore into journalissuearticles values(53.0%); in the first insemination was obtained from ≤40 days DPL group and the lowest pregnancy ratio insert ignore into journalissuearticles values(30.8%); was obtained from 61-70 days dry period group. There was a positive correlation insert ignore into journalissuearticles values(0.056); between DPL and 305-d MY and a highly significant positive correlation insert ignore into journalissuearticles values(0.141); between DPL and the number of insemination resulted in pregnancy. Present findings revealed that longer DPL might have positive effects on lactation MY, but shorter DPL practices might have better outcomes for pregnancy ratios of the first insemination for this farm.
Keywords : Dairy cattle, Dry period lenght, Herd management, Milk yield, Reproductive performance