Abstract
ABSTRACT The objective of this study was to analyze the genetic evolution of milk production, udder morphology, and animal behavior of Gir dairy cattle. Data were obtained on the predicted breeding values for milk yield of 60,226 cows born from 1968 to 2015 and standardized predicted breeding values for udder conformation and milking behavior of 7,635 cows born from 1987 to 2015. The influence of tested bulls on genetic trends was discussed, with special focus on the period after 1993, [...]
Highlights
The Dairy Gir is the result of selective breeding since the 1930s of Gir cattle (Bos taurus indicus) originally imported from India (Leão et al, 2013)
For optimized production, Genetic evolution of milk yield, udder morphology and behavior in Gir dairy cattle which includes milk yield and productive lifespan, it is indispensable that the breed have a morphological structure and body condition capable of maintaining production and permanence in the herd (Freitas et al, 2002; Campos et al, 2012; Almeida et al, 2017; Saowaphak et al, 2017)
The database used to study milk yield, mammary system morphology, reactivity, and ease of milking was obtained from the PNMGL, which is led by the Associação Brasileira de Criadores de Gir Leiteiro (ABCGIL) and Embrapa Gado de Leite since 1985
Summary
The Dairy Gir is the result of selective breeding since the 1930s of Gir cattle (Bos taurus indicus) originally imported from India (Leão et al, 2013). Breeding programs primarily emphasize increased milk yield and its constituents (Prata et al, 2015) To optimize both yield and longevity, it is indispensable that the morphological structure and body condition sustain production and continue in the herd. For optimized production, Genetic evolution of milk yield, udder morphology and behavior in Gir dairy cattle which includes milk yield and productive lifespan, it is indispensable that the breed have a morphological structure and body condition capable of maintaining production and permanence in the herd (Freitas et al, 2002; Campos et al, 2012; Almeida et al, 2017; Saowaphak et al, 2017). According to Lagrotta et al (2010) and Saowaphak et al (2017), conformation traits are of extreme importance for dairy cattle breeding, since they provide greater production system efficiency. Behavioral traits are important, since reactivity and ease of milking are fundamental for greater efficiency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
