Consulta: creatorFacets:"Masuda, Yutaka"
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Data/hora: 10/06/2024 07:53:15

Effects of heat stress on production, somatic cell score and conception rate in Holsteins
Provedor de dados: Obihiro University of Agriculture and Veterinary Medicine Academic Repository (OAK)
Autores: Hagiya, Koichi; Hayasaka, Kiyoshi; Yamazaki, Takeshi; Shirai, Tatsuo; Osawa, Takefumi; Terawaki, Yoshinori; Nagamine, Yoshitaka; Masuda, Yutaka; Suzuki, Mitsuyoshi.
We examined the effects of heat stress (HS) on production traits, somatic cell score (SCS) and conception rate at first insemination (CR) in Holsteins in Japan. We used a total of 228242 records of milk, fat and protein yields, and SCS for the first three lactations, as well as of CR in heifers and in first- and second-lactation cows that had calved for the first time between 2000 and 2012. Records from 47 prefectural weather stations throughout Japan were used to calculate the temperature-humidity index (THI); areas were categorized into three regional groups: no HS (THI&lt;72), mild HS (72THI&lt;79), and moderate HS (THI79). Trait records from the three HS-region groups were treated as three different traits and trivariate animal models were used. The...
Palavras-chave: Genetic correlation; Heat-stress; Holsteins; Temperature-humidity index (THI).
Ano: 2017
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4575