Study of Longevity in Dairy Cattle
محورهای موضوعی : Camel
M. Rakhshani Nejad
1
(Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran)
N. Emamjomeh Kashan
2
(Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran)
M. Rokouei
3
(Department of Animal Science, Faculty of Agriculture, University of Zabol, Zabol, Iran|Department of Animal and Poultry Science, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran)
M. Aminafshar
4
(Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran)
H. Faraji-Arough
5
(Research Center of Special Domestic Animals, University of Zabol, Zabol, Iran)
کلید واژه: Gibbs sampling, hazard function, survival heritability,
چکیده مقاله :
This study aimed to estimate the effect of environmental factors on variation of the longevity and the genetic parameters of the trait in Holstein dairy cows in Iran. The records of 181738 cows in the years 2001 to 2018 were provided by the Animal Breeding Center of Iran (Karaj, Iran). Profitability in dairy herds depends on animal survival in the herd, which is provided by reducing involuntary culling and increasing the voluntary culling in the herd. The survival was defined as the lifespan, the lifetime milk, fat, and protein yield after first calving, and lifetime days in milk. The effect of environmental factors on traits and risk of culling was estimated using Survival kit and cmprsk statistical packages. The variance components were estimated by Gibbs sampling method based on exponential distribution, incomplete data, and survival analysis. The effects of herd, season, and age of calving on traits were significant (P<0.001). The risk of culling of cows with difficult calving was higher than others. The risk of culling of cows calved in spring was higher than in other seasons. The heritability of different traits of survival estimated to be 0.0067-0.0147. The results showed that the effect of different environmental factors on variation of longevity is significant, and the heritability of the trait is low. However, a review of the literature indicates that, despite the low heritability of the trait, it can be improved in a population through genetic selection. This approach is justified, as longevity is not only important for the farmer from the economic point of view, but it also affects the increase of animal welfare and social acceptance of the dairy sector.
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