Relationships between type traits and herd life of Holstein cows in different dairy housing types in Japan

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  • 飼養形態を考慮した北海道のホルスタイン種の体型形質と在群期間の関係

Abstract

<p>Here, we investigated the relationships between herd life (HL) and type-classification scores among dairy cattle in 3 housing types (tie stall [TS], free stall [FS], and grazing [GZ]). We assessed six classification traits (feet and legs [FL], chest width, angularity, udder support, udder depth [UD], and front teat placement [FTP]) in primiparous cows with 1st calving between 1993 and 2008 and for which HL data were available (i.e., 126,492 data on HL for TS; 88,851 for FS; and 3,989 for GZ). The GLM procedure (R Statistics) was used to estimate the least squares means (LSMs) of HL on type scores. LSMs of HL increased with increasing FL score (≧79). With FL scores<79, LSMs of HL decreased linearly with decreasing scores in TS and FS but not GZ. For all housing types, LSMs of HL increased as UD score increased. Intermediate scores for FTP gave the highest LSMs of HL for all housing types. For all traits, LSMs of HL were similar for TS and FS. However, for GZ, a low FL score had little effect on HL.</p>

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