![]() The findings of this study suggest that AT, MRT, and THI were the most important factors that could affect seminal characteristics of bulls raised in a subtropical climate.Īdaptation Cryopreservation Livestock Reproduction Sperm.Ĭopyright © 2022 Elsevier B.V. The principle component analysis (PCA) provided similar results, with all of the taurine cattle breeds except JBC and YBC forming a tight cluster clearly separate from indicine cattle and most of the Chinese populations occupied intermediate positions between the two major clusters (fig. External morphological traits were considered non-important in the final model. Semen quality between breeds and seasons was similar, satisfactory, and heat stress was not sufficient to impair spermatozoa viability. Bos taurus (or Bos taurus taurus), typically referred to as taurine cattle, are generally adapted to cooler climates and include almost all cattle breeds. Results of the PLS regression and Spearman's correlations confirmed a negative relationship between climatic variables and sperm traits in both seasons. The relative cross-coalescence analysis suggested a decline to 0.5 between East Asian taurine (Tibetan) and Eurasian taurine (Gelbvieh) or European taurine (Hereford) cattle at 6.6 kya (0.25 to. Environmental traits differed significantly between seasons. In all, 505 animals derived from 10 taurine and 3 zebu cattle breeds were genotyped across more than 770,000 SNP markers to investigate the genomic changes subsequent to the separation between taurine and zebu cattle, which occurred at a date between 330 thousand and 2 million years ago 1, 2. Furthermore, body and testicular metrics, as well as hair coat characteristics, were recorded in each season on all bulls. ![]() In this country, 36 of the dairy cattle are now crossbreds. New Zealand imported only taurine cattle, mainly dairy breeds of English and Dutch origin. Environmental data such as air temperature (AT), relative humidity (RH), mean radiant temperature (MRT) and temperature-humidity index (THI) were measured. The gradual incrossing of Indian and American zebus, which are resistant against tick-borne diseases, continued until after WWII and restored cattle husbandry in the tropical parts of Australia. In addition, the sperm kinetics using CASA was assessed on post-thawed semen. Motile cells, sperm vigor, sperm concentration, sperm membrane status, and sperm abnormalities were analyzed in fresh and post-thawed semen. Three ejaculates were obtained from each bull (Crioulo Lageano and Angus) in summer and winter seasons. The present study was carried out in the Southern region of Brazil and aimed to assess the seasonal influence of climatic factors and external morphology of the animals on the semen quality. Livestock production is considered an important factor influencing global warming however, climate change has also been considered one of the major factors affecting livestock production and reproduction.
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