Genetic parameters for calving ease in Italian Simmental cattle
نویسندگان
چکیده
منابع مشابه
Genetic Evaluation of Calving Ease for Walloon Holstein Dairy Cattle
Calving complications have an incidence on the economic profitability of dairy herds. In the Walloon Region of Belgium, calving ease data recording is being done on voluntary basis since 2000. This allows now the implementation of a genetic evaluation of Holstein dairy cattle addressing the need of dairy breeders to select bulls in order to reduce frequency of calving problems. Calving ease sco...
متن کاملGenetic parameters for calving ease, gestation length, and birth weight in Charolais cattle.
In this study, a 3-trait linear model was used to obtain genetic parameters for direct and maternal components of calving ease (CE), gestation length (GEST), and birth weight (BWT). Calving ease scores were transformed into Snell scores and expressed as percent unassisted calving (SC), ranging from 0 to 100% (least to greatest ease). A total of 40,420 records (n = 14,403 for CE) were obtained f...
متن کاملGenetic parameters for growth, reproductive performance, calving ease and suckling performance in beef cattle heifers
There is considerable concern about the consequences on fitness-related traits of using narrow breeding objectives for production traits. The aim of this study was to assess the potential consequences of selection for growth in French beef cattle breeds by estimating genetic correlations between growth, reproduction, calving and suckling traits of Charolais, Limousin and Blonde d’Aquitaine heif...
متن کاملReducing Calving Difficulty in Simmental
Many factors contributed by calf, dam and sire are associated with CD and many of these are interrelated. Deutscher (1988) came to the conclusion that "the primary cause of CD in young cows is due to a disproportion between size of calf (birth weight) and size of birth canal (pelvic size) of the cow." The relationship of these two factors are presented in the figure below quoted by Deutscher (1...
متن کاملCross Breeding in Dairy Cattle: The Effect on Calving Ease
Calving traits for frequently used dairy breeds and crossbreeds were investigated using calving records collected in Australia over a period of 18 years. Dystocia (calving difficulty) was highest for heifers calving to Holstein-Friesian bulls, and Jersey calves caused the least dystocia. Incidence of dystocia in Holsteins was influenced by the season (gestation lengths were longer in winter, re...
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ژورنال
عنوان ژورنال: Italian Journal of Animal Science
سال: 2007
ISSN: 1828-051X
DOI: 10.4081/ijas.2007.1s.117