This study investigated the effects of heat stress on milk production in Korean Holstein cows using large-scale data. Heat stress was assessed using the temperature-humidity index (THI). Weather records (2016 to 2020) were collected from 70 regional weather stations using an installed automated surface observing system (ASOS).
View Article and Find Full Text PDFStage- and cell type-specific biomarkers are important for understanding spermatogenesis in mammalian testis. The present study identified several testicular cell marker proteins in 6- and 24-month old bovine testes. In 6-month old bovine testes, spermatogonia and spermatocytes were detected but complete spermatogenesis occurred in 24-month old testes.
View Article and Find Full Text PDFJ Anim Sci Technol
July 2021
Recently, summer temperatures have frequently been abnormal in Korea owing to global warming. In summer, a decrease in feed intake rate and biological activity were observed in Hanwoo (Korean Native Cattle), leading to lower production rates in the industry. However, the precise scale of damage was not reported as with other animals of economic value.
View Article and Find Full Text PDFLimiting amino acids (AAs) for milk production in dairy cows fed on a concentrate diet of corn grain and soybean meal was evaluated in this study. Four lactating and multiparous Holstein cows (in third or fourth parities, with an average body weight of 633 ± 49.2 kg), 8 to 9 weeks into their lactation period, were used in a 4 × 4 Latin square design.
View Article and Find Full Text PDFMale germ cell apoptosis has been described in heat-damaged testes by cryptorchidism. In the present study, wild type pig testes were compared with cryptorchid testes via histological and immunohistological analyses. Spermatozoa were not detected in two cryptorchid testes and the diameters of seminiferous tubules were significantly reduced in cryptorchid pig testes compared with wild type pig testes.
View Article and Find Full Text PDFAsian-Australas J Anim Sci
January 2018
Objective: To examine the effects of () supplementation as a direct-fed microbial (DFM) on rumen fermentation in dairy cows and on coenzyme Q10 (CoQ10) transition into milk, an rumen simulation batch culture and an dairy cow experiment were conducted.
Methods: The characteristics of ruminal fermentation were investigated using rumen fluids from six cannulated Holstein dairy cows at 2 h post-afternoon feeding. A control treatment was included in the experiments based on a typified total mixed ration (TMR) for lactating dairy cows, which was identical to the one used in the study, plus at 0.
This study was conducted to evaluate the effects of dietary conjugated linoleic acid (CLA) on the performance of lactating sows and piglets as well as the immunity of piglets suckling from sows fed CLA. Eighteen multiparous Duroc sows with an average body weight (BW) of 232.0 ± 6.
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