Differences in production values between high- and low-productivity swine breeding herds.
Differences in production values between high- and low-productivity swine breeding herds.
复制标题
高生产力和低生产力猪群之间的产值差异。
DOI：
10.2527/1990.68123972x
复制
发表时间：
1990
影响因子：
3.3
通讯作者：
S. Wickstrom
中科院分区：
文献类型：
--
作者：
T. Stein;S. Duffy;S. Wickstrom
数据收集自1985年8月至1986年7月期间使用计算机化健康和管理软件程序的80名北美用户。根据以下选择标准选择了54个牛群进行分析：1）牛群库存稳定，2）记录数据完整，3）断奶至首次服务间隔大于3 d且小于20 d，4）淘汰率大于10%。这些猪群的平均断奶仔猪数为18.2头/母年（PWFY），平均产仔数为2.1窝/母年（LFY），产仔率为81%，活产率为10.2头/窝，断奶前死亡率为14.5%。与断奶仔猪/（雌性.年）值最低的14个畜群相比，高生产力畜群（即，PWFY值最高的14个牛群具有较高的LFY、产仔率、总产仔数和活产仔数/窝数以及母猪-后备母猪比; 2它们还具有较低的非生产性雌性日数（NPFD）、较低的断奶前死亡率和较少的后备母猪占雌性库存的比例。畜群大小和PWFY不相关。在控制平均哺乳期长度后，畜群规模和活产猪之间仍存在负相关（r = -.30）。非生产性女性天与LFY高度相关（r = -.87）。通过母猪-后备母猪比率测量，增加畜群年龄主要与NPFD减少相关，尽管与活产猪存在轻微正相关（r = .29）。
Data were collected from 80 North American users of a computerized health and management software program for the period August 1985 through July 1986. Fifty-four herds were selected for analysis based on selection criteria of 1) stable herd inventory, 2) complete recorded data, 3) weaning-to-first service interval greater than 3 d and less than 20 d, and 4) culling rate greater than 10%. These herds had an average of 18.2 pigs weaned/(female.year) (PWFY), 2.1 litters/(female.year) (LFY), 81% farrowing rate, 10.2 pigs born live/litter and 14.5% preweaning mortality. Compared with the 14 herds with the lowest values for pigs weaned/(female.year), high-productivity herds (i.e., the 14 herds with the highest values for PWFY) had higher LFY, farrowing rate, total and live pigs born/litter and sow-gilt ratio; they also had lower nonproductive female days (NPFD), lower preweaning mortality and fewer gilts as a proportion of female inventory. Herd size and PWFY were not correlated. A negative correlation between herd size and pigs born live remained after controlling for average lactation length (r = -.30). Nonproductive female days was highly correlated with LFY (r = -.87). Increasing herd age, measured by the sow-gilt ratio, was associated mainly with a reduction in NPFD, although there was a slight positive association with pigs born alive (r = .29).