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首页> 外文期刊>Livestock Science >Effect of strain of Holstein-Friesian and feed system on calving performance, blood parameters and overall survival.
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Effect of strain of Holstein-Friesian and feed system on calving performance, blood parameters and overall survival.

机译：荷斯坦-弗里斯兰牛和饲料系统的应变对产犊性能，血液参数和总存活率的影响。

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The objective of the present study was to quantify the effect of strain of Holstein-Friesian and pasture-based feeding system on calving performance, blood parameters and overall survival within a seasonal calving milk production system. The three strains of Holstein-Friesian compared were high production North American (HP), selected entirely for milk production, high durability North American (HD), selected based on milk production, fertility and muscularity traits, and New Zealand (NZ) selected from a seasonal calving pasture-based system. The three feed systems compared were a high grass allowance feed system typical of spring calving herds in Ireland (MP; control); an increased stocking rate system (HS) and an increased concentrate supplementation system (HC). Data comprised up to 585 lactations on 240 cows. Data were analysed using linear mixed models, generalised estimating equations and survival analysis. Strain of Holstein-Friesian had no significant effect on calving difficulty or rate of stillbirths while the effect of feed system on calving difficulty and rate of stillbirths approached significance. Strain of Holstein-Friesian had no significant effect on plasma metabolite or hormone concentrations around parturition, with the exception of urea concentration. At the beginning of the breeding season the NZ strain had lower plasma concentrations of NEFA (0.20 mmol/l) and higher IGF-I (86.8 ng/ml) than the HD (0.24 mmol/l and 66.9 ng/ml, respectively) and HP (0.26 mmol/l and 64.0 ng/ml, respectively) strains. The higher IGF-I concentration of the NZ strain was maintained during the breeding season. The NZ and HD strains survived longer than the HP strain with median survival days post-first calving of 1372, 1367 and 1033 respectively, while feed system had no significant effect on overall survival rate over the study period.
机译：本研究的目的是量化Holstein-Friesian和基于牧场的饲喂系统的应变对季节性产犊牛奶生产系统中产犊性能，血液参数和总体存活率的影响。进行比较的三种荷斯坦奶牛-Friesian菌株分别是高产北美（HP），完全用于牛奶生产而选择的，高耐用性北美（HD），根据牛奶产量，生育力和肌肉性状选择的以及新西兰（NZ）-基于季节性产犊牧场的系统。所比较的三种饲料系统是爱尔兰春季产犊畜群中典型的高草肥饲料系统（MP;对照）;增加的库存率系统（HS）和增加的浓缩物补充系统（HC）。数据包括240头母牛的585次泌乳。使用线性混合模型，广义估计方程和生存分析对数据进行分析。 Holstein-Friesian菌株对产犊困难或死产率没有显着影响，而饲喂系统对产犊困难和死产率的影响接近。除尿素浓度外，荷斯坦-弗里斯兰菌株对分娩前后血浆代谢物或激素浓度无明显影响。在繁殖季节开始时，与HD（分别为0.24 mmol / l和66.9 ng / ml）相比，NZ菌株的血浆NEFA（0.20 mmol / l）和IGF-I（86.8 ng / ml）的血浆浓度更高。 HP（分别为0.26 mmol / l和64.0 ng / ml）菌株。在繁殖季节，保持了NZ菌株较高的IGF-I浓度。 NZ和HD菌株的存活时间比HP菌株长，首次产犊后的中位存活天数分别为1372、1367和1033，而饲料系统对整个研究期间的总存活率没有显着影响。

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