Consecutive reproductive performance after parity 2 and lifetime performance in sows that had reduced pigs born alive from parity 1 to 2 in Japanese commercial herds
Consecutive reproductive performance after parity 2 and lifetime performance in sows that had reduced pigs born alive from parity 1 to 2 in Japanese commercial herds
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日本商业猪群中第 2 胎后的连续繁殖性能和母猪的终生性能，导致从第 1 胎到第 2 胎的活产仔数减少
DOI：
10.1016/j.livsci.2011.01.017
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发表时间：
2011
影响因子：
1.8
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Sasaki;Y.;Saito;H.;Shimomura;A.;Koketsu;Y.
本研究的目的是根据第1胎和第2胎（PBADIFF）之间的活产猪（PBA）差异以及第1胎和第2胎的PBA总和，比较母猪的每胎繁殖性能和终生性能。分析了101个商业牛群中47，837头母猪在第1胎和第2胎分娩的269，435次产次记录的寿命和逐胎记录。PBADIFF通过从第2胎次中的PBA值减去第1胎次中的PBA值来计算。根据PBADIFF将母猪分为9组，如下所示：≤−4、−3、−2、−1、0、+1、+2、+3或≥+4头猪。根据产次1和产次2的PBA总和的最低25分位数、第26 - 50分位数、第51 - 75分位数和最高25分位数，建立了4个PBA总和组：≤16头、17 - 20头、21 - 23头或≥24头猪。年化寿命PBA的计算方法为寿命期PBA之和除以雌性寿命天数再乘以365天。使用混合效应模型来比较PBADIFF组和汇总PBA组的性能测量值。PBADIFF ≤−4、−3、−2、−1、0、+1、+2、+3或≥+4头猪的相对频率（%）分别为13.5、6.3、8.2、10.1、11.4、11.7、10.5、8.5和19.8%。当PBADIFF从≤-4增加到≥ +4时，第1胎的PBA降低，而第2胎的PBA升高（P<0.05）。从第3胎到第6胎，PBADIFF组之间的PBA仅存在轻微差异（≤0.5头猪; P<0.05），产仔率无差异。PBADIFF为-1至+3头猪的母猪的年化寿命PBA最高，比PBADIFF ≤-4头猪的母猪高2.5至2.8头猪（P<0.05）。PBADIFF −1至+3猪之间在3至6胎次的连续性能或终生性能方面没有差异。与PBADIFF相比，PBA ≥24头的母猪在第3 ~ 6胎产次的PBA比PBA ≤16头的母猪多2.1 ~ 2.8头（P<0.05）。综合PBA ≥24头的母猪第2 ~ 5胎产仔率显著高于综合PBA ≤ 16头的母猪（P <0.05），综合PBA ≥ 24头的母猪的年平均产仔数显著高于综合PBA ≤16头的母猪（P<0.05），综合PBA ≥24头的母猪的年平均产仔数显著高于综合PBA ≤16头的母猪（P<0.05）。此外，从第2胎到第6胎，PBADIFF组之间或合计PBA组之间的断奶至首次交配间隔无差异。总之，与PBADIFF或PBA降低相比，第1胎和第2胎的PBA总和是预测母猪终生性能的更好指标。
The objectives of the present study were to compare by-parity reproductive performance and lifetime performance of sows based on the differences in pigs born alive (PBA) between parity 1 and 2 (PBADIFF) and by summed PBA in parity 1 and 2. Lifetime and by-parity records were analyzed for 269,435 parity records of 47,837 sows farrowed in parity 1 and 2 in 101 commercial herds. The PBADIFF was calculated by subtracting the value of PBA in parity 1 from that in parity 2. Sows were categorized into nine groups based on PBADIFF, as follows: ≤−4, −3, −2, −1, 0, +1, +2, +3, or ≥+4 pigs. Four summed PBA groups were built on the basis of the lowest 25th percentiles, 26th to 50th percentiles, 51st to 75th percentiles, and the highest 25th percentiles of summed PBA in parity 1 and 2: ≤16, 17 to 20, 21 to 23, or ≥24 pigs. Annualized lifetime PBA was calculated as the sum of PBA in lifetime divided by the female life days multiplied by 365days. Mixed-effects models were used to compare performance measurements by PBADIFF and summed PBA groups. Relative frequencies (%) of PBADIFF ≤−4, −3, −2, −1, 0, +1, +2, +3 or ≥+4 pigs were 13.5, 6.3, 8.2, 10.1, 11.4, 11.7, 10.5, 8.5, and 19.8%, respectively. As PBADIFF increased from ≤−4 to ≥+4, PBA in parity 1 decreased, but PBA in parity 2 increased (P<0.05). From parity 3 to 6, there was only a slight difference in PBA between the PBADIFF groups (≤0.5 pigs; P<0.05), and no difference in farrowing percentage. Sows with PBADIFF −1 to +3 pigs had the highest annualized lifetime PBA, 2.5 to 2.8 pigs greater than sows with PBADIFF ≤−4 pigs (P<0.05). There was no difference between PBADIFF −1 to +3 pigs for consecutive performance from parity 3 to 6 or lifetime performance. In contrast to PBADIFF, sows with summed PBA ≥24 pigs had 2.1 to 2.8 pigs more PBA in parity 3 to 6 than those with summed PBA ≤16 pigs (P<0.05). Sows with summed PBA ≥24 pigs had higher farrowing percentage in parity 2 to 5 and 8.4 pigs more annualized lifetime PBA than those with summed PBA ≤16 pigs (P<0.05). Additionally, from parity 2 to 6, there were no differences in weaning-to-first-mating interval between the PBADIFF groups or between the summed PBA groups. In conclusion, summed PBA in parity 1 and 2 is a better measurement to predict lifetime performance of the sows than PBADIFF or decreased PBA.
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影响猪产仔数的因素：胎次 3 至 7 只母猪。
影响因子：
1.9
作者：
Clarke Lk;Leman Ad
通讯作者：
Leman Ad
日本 2 胎母猪的活产仔猪数量减少不会对猪群生产力产生负面影响
DOI：
10.1016/j.livsci.2009.10.014
发表时间：
2010
期刊：
影响因子：
--
作者：
H. Saito;Y. Sasaki;Y. Hoshino;Y. Koketsu
通讯作者：
Y. Koketsu
妊娠早期绵羊外周血浆催乳素和黄体酮浓度的季节性差异以及两种激素之间的关系。
DOI：
10.1530/jrf.0.0520079
发表时间：
1978
期刊：
Journal of reproduction and fertility
影响因子：
--
作者：
S. Rhind;J. Chesworth;J. Robinson
通讯作者：
J. Robinson
早期受精的高生长率后备母猪的繁殖性能。
影响因子：
2.2
作者：
R. Kummer;M. Bernardi;I. Wentz;F. P. Bortolozzo
通讯作者：
F. P. Bortolozzo
影响因子：
2.6
作者：
MORROW, WEM;LEMAN, AD;ROBINSON, RA
通讯作者：
ROBINSON, RA