Effects of short dry period on complete-lactation milk and component yield in Holstein cows

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  • 乾乳期間短縮が次乳期の乳量・乳成分に及ぼす影響
  • カンニュウキカン タンシュク ガ ジニュウキ ノ ニュウリョウ ・ ニュウセイブン ニ オヨボス エイキョウ

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The objective of this study was to determine the effects of short dry period in primiparous and multiparous dairy cows on milk production for a full lactation (305-d). Thirty-one cows were assigned to 101-d (control, C, n=16) or 30-d (shortened, S, n=15) dry periods. From 2 months before parturition, C cows were fed hay and S cows were fed TMR ad libitum for 30-d ; then from 30-d prior until calving, both C and S cows were fed a moderate-energy transition diet. Postpartum, all cows were fed TMR ad libitum for 3 months. From 4 months postpartum, both C and S cows were fed grass silage, corn silage, concentrate and soybean meal according to Japanese Feeding Standard for Daily Cattle (2006) and hay ad libitum until 305 DIM. Additional milk was obtained at the end of lactation from S cows due to the extended lactation. Average daily milk yield in the following lactation was significantly greater in C cows, but the difference between treatments was smaller in third or greater lactation cows. Among primiparous cows, average daily milk yield in the following lactation was significantly greater in C cows. Total milk production from the prepartum and postpartum periods was not different between C and S cows. Average milk fat percentage, milk protein percentage, milk lactose percentage and somatic cell count were not different between treatments. Postpartum weeks at minimum BW was significantly earlier in S cows.

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