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RESEARCH ARTICLE

Twinning rate is not genetically correlated with production and reproduction traits in Iranian dairy cows

Seyedeh Samaneh Asadollahi A and Navid Ghavi Hossein-Zadeh https://orcid.org/0000-0001-9458-5860 A B
+ Author Affiliations
- Author Affiliations

A Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Gilan Province, Iran.

B Corresponding author. Email: nhosseinzadeh@guilan.ac.ir; navid.hosseinzadeh@gmail.com

Animal Production Science 60(11) 1402-1408 https://doi.org/10.1071/AN19336
Submitted: 11 June 2019  Accepted: 20 January 2020   Published: 7 April 2020

Abstract

Context: Any interruption to the reproductive system can negatively influence animal performance, and suitable animal-management practices should be adopted that will decrease the occurrence of reproductive problems such as may be the case with twinning.

Aims: The study was designed to estimate genetic parameters for twinning rate (TR) and to estimate genetic correlations between twinning rate and production and reproductive performances in the first lactation of Iranian Holstein cows.

Methods: The dataset used in this study was collected by the Animal Breeding Center of Iran during 1991–2013 and consisted of 273 742 records of calving type (singleton or twin), 435 742 records of 305-day milk yield, 424 175 records of milk fat percentage, 253 901 records of milk protein percentage, 251 558 records of first calving interval, and 153 632 records of number of days to first service. A single Gibbs sampling chain with 500 000 rounds was generated to run linear and threshold animal models.

Key results: Posterior mean estimates of heritabilities for traits were: TR 0.0028, milk yield 0.28, milk fat percentage 0.33, milk protein percentage 0.38, first calving interval 0.064, and days to first service 0.061. Genetic correlations between TR and performance traits were negligible and varied from –0.08 (between TR and milk yield) to 0.04 (between TR and protein percentage).

Conclusions: Diminishing TR by genetic selection is a slow task owing to its low heritability. Negligible genetic correlation between TR and performance traits suggests that selection for decreased TR would not cause a significant decrease in milk production, nor is it likely to have a negative impact on the reproductive performance of dairy cows.

Implications: Dairy cattle breeders should follow genetic selection programs, especially for milk-production traits, without concern for an increase in twinning rate.

Additional keywords: Bayesian methodology, categorical trait, genetic evaluation, twin birth, variance component estimation.


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