Effect of rectal temperature on efficiency of artificial insemination and embryo transfer technique in dairy cattle during hot season

Tibor Zubor, Gabriella Holló, Roland Pósa, Henrietta Nagy-Kiszlinger, Zsófia Vigh and Balázs Húth
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Tibor Zubor: Embryo Center, Kaposvár University, Kaposvár, Hungary
Gabriella Holló: Department of Animal Husbandry and Management, Institute of Animal Science, Faculty of Agricultural and Enviromental Sciences, Kaposvár University, Kaposvár, Hungary
Roland Pósa: Department of Physiology and Aminal Hygiene, Insitute of Physiology, Biochemistry and Animal Hygiene, Faculty of Agricultural and Enviromental Sciences, Kaposvár University Kaposvár, Hungary
Henrietta Nagy-Kiszlinger: Department of Animal Husbandry and Management, Institute of Animal Science, Faculty of Agricultural and Enviromental Sciences, Kaposvár University, Kaposvár, Hungary
Zsófia Vigh: Embryo Center, Kaposvár University, Kaposvár, Hungary
Balázs Húth: Department of Animal Husbandry and Management, Institute of Animal Science, Faculty of Agricultural and Enviromental Sciences, Kaposvár University, Kaposvár, Hungary

Czech Journal of Animal Science, 2020, vol. 65, issue 8, 295-302

Abstract: This study aimed to evaluate the effects of rectal temperature (RT) as well as artificial insemination (AI) technique on pregnancy rates in Holstein cows and artificial insemination or embryo transfer (ET) techniques in Holstein heifers during summer. The experiments were conducted on five dairy farms in Hungary, where 1 631 data were examined. The RT was measured immediately before reproductive techniques using a digital thermometer. The effects of animal group and month on RT were analysed. The enhancement of RT until September can be seen in heifers, but the highest RT of cows occurred during July. In line with the enhancement of RT the pregnancy rate decreased in all groups; the lowest (cows) and the highest (heifers) value was observed in July. Moderate to high negative coefficients of correlation were detected between rectal temperature and pregnancy rate for particular groups (r = -0.3 - -0.7). More than 92% of ET, 48% and 16% of inseminated heifers and cows were pregnant up to the category of 39.1 °C of RT, above this it did not change considerably in the inseminated groups. In inseminated animals with RT higher than 39.1 °C significantly higher services per conception could be observed contrary to ET heifers. ET may become a more effective strategy to improve pregnancy success in heifers compared to AI during summer.

Keywords: Holstein; summer period; heat stress; pregnancy rate (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:65:y:2020:i:8:id:14-2020-cjas

DOI: 10.17221/14/2020-CJAS

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