Publications by authors named "Nobuyoshi Matsunaga"
Article Synopsis
- - This study aimed to analyze the long-term effects of cortisol and aldosterone in the hair of six female Holstein calves using ELISA, across 18 calves over three seasons.
- - Results showed that cortisol levels were higher in the back region (white hair) compared to other regions and colors, and spring values were significantly higher than those in summer.
- - Additionally, aldosterone levels were found for the first time, with higher concentrations in the back region and white hair, showing seasonal variations with spring being higher than summer and winter.
The aim of our study was to investigate the effects of suckling on reproductive performance and metabolic status of obese (mean body condition score of more than 4.0 on a scale of 1-5) maternal Japanese Black cows during early postpartum period. We used 7 postpartum Japanese Black cattle.
View Article and Find Full Text PDFRecent studies suggest that IGF-I is a crucial regulatory factor in follicular growth during early post-partum period. The aim of the present study was to determine in detail the changing profiles of metabolic and reproductive hormones in relation to ovulation of the dominant follicle (DF) of the first follicular wave post-partum in high-producing dairy cows. Plasma concentrations of related hormones in 22 multiparous Holstein cows were measured from 4 weeks pre-partum to 3 weeks post-partum, and the development of DF was observed with colour Doppler ultrasound.
View Article and Find Full Text PDFThe aim of the present study was to investigate the changing profiles of plasma metabolic hormones during the ovarian cycles of beef and dairy cattle. We used 16 non-pregnant, non-lactating Japanese Black beef cattle (6 heifers and 10 cows; parity=2.3 +/- 0.
View Article and Find Full Text PDFThe aim of this study was to investigate the relationship between the first ovulation within 3 weeks postpartum and subsequent ovarian cycles and fertility in high producing dairy cattle in Hokkaido, Japan. In Experiment 1, 110 cows (44 primiparous and 66 multiparous) were used to determine the effects of the first ovulation within 3 weeks postpartum on subsequent ovarian cycles. Milk samples were collected twice weekly from 7 to 100 days postpartum.
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