Analysis of culling records and estimation of genetic parameters for longevity and some production traits in Holstein dairy cattle
Reads0
Chats0
TLDR
The results suggest that some opportunity may exist for genetic improvements in fat and milk yield in Iranian Holstein cattle and the relationship between longevity and production traits.Abstract:
We used data collected on 48,739 cows from 1982 to 2013 from Foka farm in the Isfahan province of Iran to assess the reasons for culling in Iranian Holstein dairy cattle in the context of breeding values of economic traits, and also to study the relationship between longevity and production traits. Estimation of (co)variance components and genetic parameters for studied traits including MY, FY, herd life (HL) and length of production life (LPL) was by AI-REML algorithm in WOMBAT software. The results showed that 27.11% of cows were culled voluntarily under the farmers’ command. The number and reasons for culling animals varied considerably over the years. Also, the results showed that involuntarily culled animals were valuable with significantly higher breeding values for MY and FY (P < .0001) than those of voluntarily culled individuals. The estimates of heritability for longevity traits (HL and LPL) were low (0.11 and 0.09), but their genetic correlation with production traits were high and posi...read more
Citations
More filters
Journal ArticleDOI
Genetic analysis of longevity and lamb survival from birth to yearling in Moghani sheep
TL;DR: Estimation of genetic parameters for longevity and survival traits from birth to yearling in Moghani breed of sheep suggest that lamb survival could be improved through direct selection within the flock.
Journal ArticleDOI
Survival analyses in Holstein cows considering direct disease diagnoses and specific SNP marker effects.
T. Shabalina,Tong Yin,Sven König +2 more
TL;DR: The small number of significantly associated SNP in genome-wide associations and the minor effect of specific SNP on LPL in survival analyses underline the polygenetic nature of longevity.
Journal ArticleDOI
The influence of genotypic factors on longevity and lifetime production of dairy cows
TL;DR: The influence of genotypic factors (breed, Holstein share heredity, line or related group, sire) on the longevity and lifetime production of dairy cows has been investigated in a retrospective statistical experiment on the commercial dairy farm “Terezyne”.
Dissertation
Alternative approaches for analyses of production performance from automatic milking systems in South Africa
TL;DR: Findings from this study confirm that the AfiFarm herd management software permit extraction and analyses of multiple variables imperative to dairy management at the herd and cow level.
Journal ArticleDOI
A comparison between Polish Holstein-Friesian and F1 hybrid Polish Holstein Friesian × Swedish Red cows in terms of milk yield traits
TL;DR: The experiment demonstrated a highly significant impact of heterosis on performance parameters and technological quality of milk in F1 generation obtained as a result of crossbreeding between PHF cows and SRB bulls.
References
More filters
Journal ArticleDOI
Genetic Analysis of Herd Life in Canadian Dairy Cattle on a Lactation Basis Using a Weibull Proportional Hazards Model
TL;DR: Milk yield was by far the most important factor influencing survival, and the hazard increased as the milk production of the cows decreased, andThe hazard alsoincreased as the fat content increased compared with the average group.
Journal ArticleDOI
Influence of involuntary culling on optimum culling rates and annualized net revenue.
TL;DR: In this paper, the authors used dynamic programming to make insemination and culling decisions and found that involuntary culling probabilities have a large impact on the annualized net revenue.
Journal ArticleDOI
Phenotypic associations between traits other than production and longevity in New Zealand dairy cattle.
TL;DR: Of the individual TOP describing the physical characteristics of the cow, the udder-related TOP exhibited the largest influence on functional longevity, and farmer opinion explained the largest proportion of variation in true and functional longevity among cows.
Journal ArticleDOI
Prediction of longevity breeding values for US Holstein sires using survival analysis methodology.
TL;DR: Logistic regression of daughters' stayability to 36, 48, 60, 72, or 84 mo of life on sires' PTA indicated that the proportional hazards model yielded more accurate predictions of daughter longevity than the linear animal model, even though the latter relied on denser pedigree information.
Journal ArticleDOI
Genetic analysis of longevity in Dutch dairy cattle using random regression
TL;DR: In this article, a random regression model with second-order Legendre polynomials was fitted for the additive genetic effect to evaluate the survivability of dairy cows, and the authors investigated whether these methods also need to take account of survival being a different trait across the entire lifespan of a cow.