נגישות
menu      
חיפוש מתקדם
Maltz, E., Inst. of Agricultural Engineering, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Kroll, O.
Barash, H., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Shamy, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Silanikove, N., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
How the interactions among heat stress, calving season and milk yield (MY) affects lactation and body weight (BW) curves was studied by analyzing the daily records of MY and BW of dairy cows. The summer calving cows (SC) attained minimal BW sooner than winter calving cows (WC), the differences between high yielding (HY; MY≥40 1/d) SC and WC being greater than differences between low yielding (LY; MY<40 1/d). The minimal BW was lower in all SC than in WC and this could be related to the differences between the HY cows. MY peak was higher in all WC than in all SC, similar in LY cows among the two treatments, and higher in HY WC than in HY SC. The 4.4% differences in MY during the first 40 wk postpartum between all WC (8960 1) and all SC (8568) could be related to 8.0% differences between HY WC (10444 1) and HY SC (9604 1). During the summer peak MY occurred later than during the winter irrespective of the production level. We have shown that heat stress during early lactation affects the entire lactation and BW curves in dairy cows, and that heat stress negatively interacts with MY.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Lactation and body weight of dairy cows: Interrelationships among heat stress, calving season and milk yield
9
Maltz, E., Inst. of Agricultural Engineering, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Kroll, O.
Barash, H., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Shamy, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Silanikove, N., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Lactation and body weight of dairy cows: Interrelationships among heat stress, calving season and milk yield
How the interactions among heat stress, calving season and milk yield (MY) affects lactation and body weight (BW) curves was studied by analyzing the daily records of MY and BW of dairy cows. The summer calving cows (SC) attained minimal BW sooner than winter calving cows (WC), the differences between high yielding (HY; MY≥40 1/d) SC and WC being greater than differences between low yielding (LY; MY<40 1/d). The minimal BW was lower in all SC than in WC and this could be related to the differences between the HY cows. MY peak was higher in all WC than in all SC, similar in LY cows among the two treatments, and higher in HY WC than in HY SC. The 4.4% differences in MY during the first 40 wk postpartum between all WC (8960 1) and all SC (8568) could be related to 8.0% differences between HY WC (10444 1) and HY SC (9604 1). During the summer peak MY occurred later than during the winter irrespective of the production level. We have shown that heat stress during early lactation affects the entire lactation and BW curves in dairy cows, and that heat stress negatively interacts with MY.
Scientific Publication
You may also be interested in