Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows

Autor: Arash Chegini, Abdol Ahad Shadparvar, Navid Ghavi Hossein-Zadeh, Behrooz Mohammad-Nazari

Publikováno v: Revista Colombiana de Ciencias Pecuarias, Vol 32, Iss 2, Pp 81-89 (2019)

Background: Fertility and health traits, other than production traits, have a major role in the profitability of dairy cattle. Therefore, it seems necessary to include the afore mentioned traits in breeding programs. Hence, genetic parameters are nee

Externí odkaz: https://doaj.org/article/56dc6b3c1eea4c88a8644d9dbccd7b0c

Estimation of genetic and environmental relationships between milk yield and different measures of mastitis and hyperkeratosis in Holstein cows

Autor: Arash Chegini, Navid Ghavi Hossein-Zadeh, Hossein Hosseini-Moghadam, Abdol Ahad Shadparvar

Publikováno v: Acta Scientiarum: Animal Sciences, Vol 38, Iss 2 (2016)

In this research, records of milk yield, mastitis occurrence and teats hyperkeratosis of 453 Holstein cows from a large herd with calving dates from December 2012 to December 2014 was used to estimate genetic and environmental correlations between mi

Externí odkaz: https://doaj.org/article/811e421686254685bcbad5a656dd7ee0

Relações genéticas e ambientais entre produção de leite, persistância de produção de leite, contagem de células somáticas e intervalo de pertos em vacas Holstein

Autor: Navid Ghavi Hossein-Zadeh, Abdol Ahad Shadparvar, Behrooz Mohammad-Nazari, Arash Chegini

Publikováno v: Revista Colombiana de Ciencias Pecuarias, Vol 32, Iss 2, Pp 81-89 (2019)
Revista Colombiana de Ciencias Pecuarias, Volume: 32, Issue: 2, Pages: 81-89, Published: JUN 2019

Background: Fertility and health traits, other than production traits, have a major role in the profitability of dairy cattle. Therefore, it seems necessary to include the afore mentioned traits in breeding programs. Hence, genetic parameters are nee

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bc91eb6cae5c24844ff5d352c0f9936
https://doi.org/10.17533/udea.rccp.v32n2a01

Appropriate selection indices for functional traits in dairy cattle breeding schemes

Autor: Seyed Hossein Hosseini Moghaddam, Abdol Ahad Shadparvar, Arash Chegini, Navid Ghavi Hossein-Zadeh

Publikováno v: The Journal of dairy research. 86(1)

The objective of this study was to establish different single or multiple trait selection indices to calculate genetic and economic gains by combining some production, reproduction and udder health traits in a population similar to the overall practi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::402711e60ab4c3ae2647da29f78fe37d
https://pubmed.ncbi.nlm.nih.gov/30520398

Genetic aspects of some reproductive, udder health and energy status traits in Holstein cows

Autor: Abdol Ahad Shadparvar, Navid Ghavi Hossein-Zadeh, Arash Chegini, Seyed Hossein Hosseini Moghaddam

Publikováno v: Theriogenology. 130

The objective of this study was to estimate heritability as well as genetic and environmental relationships between days to first heat (DFH), days to first service (DFS), interval from calving to conception (ICC), calving interval (CI) and number of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a36fa15163b50a77cf2cf39e115bc99
https://pubmed.ncbi.nlm.nih.gov/30852369