Abstract
The aim of this study is to compare the pregnancy rates by applying embryo transfer to the cows which are not pregnant and should be removed from herd as repeat breeder. In this study, 87 randomly selected Holstein cows utilized. The repeat breeder cows (n=45) were selected from at least one giving birth, having regular sexual cycle, missing clinical worsening into genital organ and not displaying an abnormal discharge. On the other hand, it was selected from nonpregnant cows which inseminated artificially at least 3 times or more. Besides, cows that used as the control group (n=42) were selected from the cows without any artificial insemination postnatally. The PGF2α application was performed to all recipient cows which are considered to benefit from as a recipient in control and testing groups just 24 days before the flushing day. After this application, the cows showing estrous symptoms were recorded and determined as candidate recipients. The pregnancy rates were 35.6% and 50% for testing and control groups, respectively and the difference between the groups was significant (P<0,05). As a result, even this difference between the groups it has been concluded that embryo transfer can be used to conceive especially for high-yielding cows as a treatment method for repeat breeder cows. Thereby, embryo transfer from the cows with high superior characteristics to the high milk yielding cows which have infertility problems can economically be beneficial by utilizing the high milk yield in the later lactation without any replacement cost.
Highlights
The aim of this study is to compare the pregnancy rates by applying embryo transfer to the cows which are not pregnant and should be removed from herd as repeat breeder
Embryos obtained from lactating cows selected as donors at the Eastern Mediterranean Agricultural Research Institute were transferred to the cows that were trial group that was repeat breeder cows and the control group that did not receive any postpartum treatment
Sixteen head repeat breeder cows were pregnant from 45 recipient cows in the trial group
Summary
The aim of this study is to compare the pregnancy rates by applying embryo transfer to the cows which are not pregnant and should be removed from herd as repeat breeder. Many problems are faced affecting of cows milk and reproduction yield in countries where modern dairy farming is carried out One of these is repeat breeder cow (RBC) problem. In a wide definition about this problem; the animals which is younger than 10 years old and had at least one birth, having regular sexual cycles, have not a clinical disorder in the genital organs and not showing an abnormal discharge, do not conceive of mating with a fertile bull or artificial inseminating 3 or more times are called repeat breeder cows (Alaçam 2010; Kaymaz 2012). The transfer of an embryo could bypass certain causes of infertility
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