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タイトル: Effect of Suckling on the Reproductive Performance and Metabolic Status of Obese Japanese Black Cattle during the Early Postpartum Period
著者: KAWASHIMA, Chiho
KIDA, Katsuya
MATSUHASHI, Miki
MATSUI, Motozumi
SHIMIZU, Takashi
MATSUNAGA, Nobuyoshi
ISHII, Mitsuo
MIYAKE, Yoh-Ichi
MIYAMOTO, Akio
川島, 千帆
木田, 克弥
松井, 基純
清水, 隆
石井, 三都夫
三宅, 陽一
宮本, 明夫
松長, 延吉
キーワード: Japanese Black cattle
Metabolic status
Obesity
Reproductive performance
Suckling
発行日: 2008
出版者: 日本繁殖生物学会
誌名: Journal of Reproduction and Development
巻: 54
号: 1
開始ページ: 46-51
抄録: 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. Four cows were suckled ad libitum (suckled) until completion of their first artificial insemination (AI), while 3 cows were not suckled at all because they were separated from their calves immediately after parturition (non-suckled). Body weight and plasma concentrations of metabolites and hormones were measured from wk 1 to 9 postpartum. Ovarian activity was detected using plasma progesterone concentration, and all cows received their first AI after application of the Ovsynch protocol at approximately 4 months postpartum. Although body weights of non-suckled cows increased during experimental period (P<0.05), those of suckled cows remained unchanged. Plasma concentrations of glucose of non-suckled cows were higher at wk 2 postpartum (P<0.05) and their levels of non-esterified fatty acid tended to be lower at wk 1 and 2 postpartum compared with suckled cows (P<0.1); however, these differences between groups were not observed with progression of postpartum period. In addition, plasma insulin concentrations of non-suckled cows were higher than those of suckled cows during experimental period (P<0.05). During sampling period (wk 0 to 9 postpartum), onset of normal ovarian cycle was observed in all non-suckled and 2 of 4 suckled cows, and it was delayed in other 2 suckled cows compared with non-suckled cows; however, 3 suckled cows conceived at the first AI after application of the Ovsynch protocol; none of non-suckled cows conceived at this time. Overall, we suggest that suckling seems to reduce increase of body weight after parturition, although it does not improve obesity, and influences conception despite delay in resumption of normal ovarian cyclicity in obese Japanese Black cows.
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/2991
ISSN: 13484400
09168818
権利情報: 日本繁殖生物学会
出現コレクション:06001学術雑誌論文

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