Effects of spring-calving compared to autumn-calving on the lactation curve and milk quality in Norwegian herds

被引：1
|
作者：
Schei, I. [1 ,2 ]
Harstad, O. M. [1 ]
Karlengen, I. J. [1 ]
Garmo, T. H. [1 ]
Odegard, J. [1 ]
Klemetsdal, G. [1 ]
机构：
[1] Norwegian Univ Life Sci, Dept Anim & Aquacultural Sci, N-1432 As, Norway
[2] TINE Norwegian Dairy Assoc, N-1430 As, Norway
来源：
JOURNAL OF ANIMAL AND FEED SCIENCES | 2007年 / 16卷
关键词：
lactation curve; autumn; spring; milk quality;
D O I：
10.22358/jafs/74168/2007
中图分类号：
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号：
0905 ;
摘要：
The objective of this work was to study the effects of spring calving in comparison with autumn-calving on the trajectory of both milk yield and quality (percentages of protein, fat and lactose, and also somatic cell counts (SCC) and urea). On average, autumn-calvers had 0.8 and 1.2 kg higher daily milk yield and ECM (energy-corrected milk), respectively, than those calving in the spring, due to a higher yield in mid- and late lactation. Milk fat and lactose were also higher and SCC lower for those calving in autumn, and the reduction of protein and fat percentages in early lactation was lower. These results suggest that maintaining a high milk yield is a greater challenge for spring-calving cows on pasture feeding than for autumn-calving cows fed indoors.
引用
收藏
页码：156 / 160
页数：5
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