Genetic relationships of alternative somatic cell count traits with milk yield, composition and udder type traits in Italian Jersey cows

被引：19

作者：

Bobbo, Tania ^{[1
]}

Roveglia, Chiara ^{[1
]}

Penasa, Mauro ^{[1
]}

Visentin, Giulio ^{[2
]}

Finocchiaro, Raffaella ^{[2
]}

Cassandro, Martino ^{[1
]}

机构：

[1] Univ Padua, Dept Agron Food Nat Resources Anim & Environm, Padua, Italy

[2] Assoc Nazl Allevatori Razza Frisona & Jersey Ital, Cremona, Italy

来源：

ANIMAL SCIENCE JOURNAL | 2019年 / 90卷 / 07期

关键词：

dairy cattle; genetic selection; mastitis; somatic cell score; udder conformation; LINEAR TYPE TRAITS; BODY CONDITION SCORE; 1ST; 3; LACTATIONS; PROCESSING CHARACTERISTICS; REPRODUCTIVE TRAITS; UREA NITROGEN; MASTITIS; PARAMETERS; HOLSTEIN; REPEATABILITY;

D O I：

10.1111/asj.13204

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

The aim of this study was to estimate genetic associations between alternative somatic cell count (SCC) traits and milk yield, composition and udder type traits in Italian Jersey cows. Alternative SCC traits were test-day (TD) somatic cell score (SCS) averaged over early lactation (SCS_150), standard deviation of SCS of the entire lactation (SCS_SD), a binary trait indicating absence or presence of at least one TD SCC >400,000 cells/ml in the lactation (Infection) and the ratio of the number of TD SCC >400,000 cells/ml to total number of TD in the lactation (Severity). Heritabilities of SCC traits, including lactation-mean SCS (SCS_LM), ranged from 0.038 to 0.136. Genetic correlations between SCC traits were moderate to strong, with very few exceptions. Unfavourable genetic associations between milk yield and SCS_SD and Infection indicated that high-producing cows were more susceptible to variation in SCC than low-producing animals. Cows with deep udders, loose attachments, weak ligaments and long teats were more susceptible to an increase of SCC in milk. Overall, results suggest that alternative SCC traits can be exploited to improve cow's resistance to mastitis in Italian Jersey breed.

引用

页码：808 / 817

页数：10