O'Hara Lisa A, Båge Renée, Holtenius Kjell
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, PO Box 7045, 750 07, Uppsala, Sweden.
Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, 750 07, Uppsala, Sweden.
Acta Vet Scand. 2016 Oct 20;58(Suppl 1):68. doi: 10.1186/s13028-016-0251-2.
Optimal body condition in early lactation is generally accepted as a prerequisite for good reproductive performance. Examination of milk progesterone profiles offers an objective method for characterization of postpartum ovarian activity in dairy cows. The present study investigated the relationship between body condition after calving, some metabolic parameters in blood plasma, and fertility, as reflected by milk progesterone profiles in the two dairy breeds Swedish Red (SR) and Swedish Holstein (SH).
Multiparous dairy cows (n = 73) of SR and SH breeds were selected and divided into three groups based on their body condition score (BCS) after parturition. Selected plasma metabolites were determined, milk progesterone profiles were identified and body condition was scored. Over-conditioned cows and atypical progesterone profiles were more common among SR cows. Insulin sensitivity was lower and IGF 1 higher among SR cows. Insulin was positively related to body condition, but not related to breed.
Atypical progesterone profiles were more common and insulin sensitivity lower in SR than in SH cows, but the SR breed had a higher proportion of over-conditioned SR cows. It is reasonable to assume that breed differences in body condition contributed to these results.
泌乳早期的最佳体况通常被认为是良好繁殖性能的先决条件。检测牛奶孕酮水平为表征奶牛产后卵巢活动提供了一种客观方法。本研究调查了瑞典红（SR）和瑞典荷斯坦（SH）这两个奶牛品种产犊后的体况、血浆中的一些代谢参数与受胎率之间的关系，受胎率通过牛奶孕酮水平反映。
选择了SR和SH品种的经产奶牛（n = 73），并根据它们产后的体况评分（BCS）分为三组。测定选定的血浆代谢物，确定牛奶孕酮水平并进行体况评分。过度肥胖的奶牛和非典型孕酮水平在SR奶牛中更为常见。SR奶牛的胰岛素敏感性较低，胰岛素样生长因子1较高。胰岛素与体况呈正相关，但与品种无关。
与SH奶牛相比，SR奶牛中非典型孕酮水平更为常见，胰岛素敏感性更低，但SR品种中过度肥胖的奶牛比例更高。合理推测体况的品种差异导致了这些结果。
