Consequences of variation in weaning-to-estrus interval on reproductive performance of swine females
Consequences of variation in weaning-to-estrus interval on reproductive performance of swine females
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DOI：
10.1016/j.livsci.2006.02.007
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发表时间：
2006-08-01
影响因子：
1.8
通讯作者：
Bortolozzo, F. P.
中科院分区：
文献类型：
--
作者：
Poleze, E.;Bernardi, M. L.;Bortolozzo, F. P.
根据断奶至发情期间隔（WEI）的女性的频率分布进行了评估，在一个数据库中包含15,600个巴西农场的育种记录。评价了WEI持续时间对繁殖性能的影响，强调了非常短的WEI（0至2天）的影响。分析中仅纳入WEI长达21天、哺乳期为13 - 26天且产次为1 - 8次的雌性动物。断奶后2天内发情率为6.1%。经产和经产雌鼠中，WEI为3- 5d的复情率最低。经产母猪在断奶后第一天发情时RER最高，FR最低，经产母猪在断奶当天发情时RER最高，FR最低。在两个胎次中，0-2、6-8、9-12和13-18天的WEI导致FR低于3-5天的WEI所观察到的FR（P < 0.05）。在PO 1雌性动物中，WEI为6-8天和9-12天的雌性动物的后续产仔数（SLS）最低（P < 0.05）。在PO > 1的雌性中，SLS从WEI 0-2到WEI 3-5天显著增加，在WEI 6-8天的雌性中下降，在WEI 9 - 21天的雌性中再次增加。WEI对生殖性能的负面影响在WEI非常短（0-2天）的雌性和WEI为6-12天的雌性中是明显的。(c)2006 Elsevier B. V.保留所有权利。
Frequency distribution of females according to weaning-to-estrus interval (WEI) was evaluated in a database containing 15,600 breeding records of one Brazilian farm. The consequences of WEI duration on the reproductive performance was evaluated, emphasising on the effect of very short WEI (0 to 2 days). Only females with WEI up to 21 days, lactation length of 13 to 26 days and parity 1 to 8 were included in the analyses. The average WEI was 4.8 days and the percentage of females showing estrus within 2 days after weaning was 6.1%. In both primiparous (PO 1) and multiparous females (PO > 1) those with WEI of 3-5 days showed the lowest return to estrus rate. The highest RER and the lowest FR were observed when estrus occurred on the day after weaning, for primiparous sows, and on the day of weaning, for multiparous sows. In both parity classes, WEI of 0-2, 6-8, 9-12 and 13-18 days resulted in FR lower (P < 0.05) than those observed for WEI of 3-5 days. In PO 1 females, the lowest subsequent litter size (SLS) was observed in those with WEI of 6-8 and 9-12 days (P < 0.05). In PO > 1 females SLS increased significantly from WEI 0-2 to WEI 3-5 days, it decreased in females with WEI of 6-8 days and increased again in females with WEI of 9 to 21 days. A negative effect of WEI on reproductive performance is clear in females with very short WEI (0-2 days) and in those with WEI of 6-12 days. (c) 2006 Elsevier B.V. All rights reserved.