The Publisher regrets that this article is an accidental duplication of an article that has already been published in Theriogenology, 126C (1 March 2019) 303-309, http://dx.doi.org/10.1016/j.theriogenology.2018.12.025. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
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