DOI - Mendel University Press

DOI identifiers

DOI: 10.11118/978-80-7509-994-5-0074

THE EFFECT OF ENERGY BALANCE AND NON-NUTRITIONAL FACTORS ON PREGNANCY SUCCESS AFTER THE 1ST INSEMINATION IN DAIRY COWS

BEÁTA FRAŇOVÁ1, IVETA MASKAĽOVÁ1, PETRA TIMKOVIČOVÁ LACKOVÁ1
1 Department of Animal Nutrition and Husbandry, University of veterinary medicine and pharmacy in Košice, Komenského 73, Košice Slovakia

This study aimed to evaluate energy balance and climatic conditions on pregnancy success after 1st insemination in Holstein cows. Successful conception rate, including the hypothalamic–pituitary–ovarian axis is most sensitive to energy balance and the availability of metabolic fuels. The analyzed negative energy balance of cows with successful insemination was confirmed at a lower level of -14.4 MJ/d, while in 74% of dairy cows with unsuccessful insemination NEB was at the level of -19.4 MJ/day. The level of NEB at the level - 47 MJ/day resp. -53 MJ/d corresponds to a weight loss of 2.3 kg resp. 2.7 kg in the 1st month after parturition. The pregnancy success after artificial insemination in summer is reduced and affected by reduced dry matter intake, the function of the endocrine system's level of hormones and the level of negative energy.

Keywords: temperature, energy balance, milk, reproduction

pages: 74-86, online: 2024



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