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Title: Estimate the genetic parameters and analysis of culling reasons in Iranian Holstein dairy cattle
Contributor(s): Keshavarz, H (author); Dehnavi, E  (author)orcid ; Small, A (author)
Publication Date: 2023-07-26
Open Access: Yes
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Many animals are culled from the herd on dairy farms annually due to health problems, and this involuntary culling causes significant economic losses to the dairy industry. This study aimed to identify the trend of culling reasons and lifespan and estimate their genetic parameters. The cow history records and pedigree files of 11 large commercial dairy farms with cows culled from 1995 to 2015 were used. It is estimated that 18.6% of cows are culled voluntarily by farmers, while 81.4% of cows leave the herd involuntarily. Three main reasons for involuntarily culling were reproductive problems (25.9%), death and others (16.7%), and infectious diseases (14.3%). Over time, the distributions of culling reasons have altered with a reduction in "death and others", suggesting a better or more precise diagnosis of culling reasons and improvement in dairy farm recording systems. The average lifespan of cattle was 4.42 years with heritability of 0.14. The heritabilities of culling reasons were very low and ranged from 0.03±0.02 (metabolic and digestive disorders) to 0.08±0.03 (mastitis and udder problems). The significance of the maternal effect for some traits like mastitis indicates that it may be possible to improve an individual's health and, therefore, farm profitability genetically.

Publication Type: Conference Publication
Conference Details: AAABG 2023: 25th Conference of the Association for the Advancement of Animal Breeding and Genetics, Perth, Australia, 26th - 28th July, 2023
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.25, p. 314-317
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2020: 100401 Beef cattle
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

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