FACTORS AFFECTING SHAPE OF LACTATION CURVE IN CATTLE

被引:149
作者
WOOD, PDP
机构
[1] Milk Marketing Board, Thames Ditton, Surrey
来源
ANIMAL PRODUCTION | 1969年 / 11卷
关键词
D O I
10.1017/S0003356100026945
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 lactation curve in cattle has been explained by the expressionyn = Anbe-cnwhere yn is the average daily yield in the nth week, and A, b, and c are constants. In general, in a sample of 859 Friesian lactations recorded during 1964–65 daily yield was depressed during the winter months (18·8% in January) and stimulated during the spring (14·7% in May) to an extent which was independent of the stage of lactation. Winter calvers on the other hand tended to produce more in total lactation than spring calvers (14·5% for animals calving in November as opposed to those calving in April). Using a suitable technique it is possible to predict month by month output from a cow, or herd, accurately enough to furnish a basis for forward planning. © 1969, British Society of Animal Science. All rights reserved.
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页码:307 / &
相关论文
共 14 条
[1]  
BLAU G., 1961, ZUECHTUNGS KUNDE, V33, P161
[2]  
CERSOVSKY H., 1957, Tierzucht, V11, P185
[3]  
Fisher R., 1915, BIOMETRIKA, V10, P507
[4]  
GAINES WL, 1927, 288 ILL AGR EXP STN
[5]  
GERDEMANN H, 1964, THESIS HANOVER
[6]  
MAYMONE B., 1959, Annali della Sperimentazione Agraria, V13, P1005
[7]   INVERSE POLYNOMIALS A USEFUL GROUP OF MULTI-FACTOR RESPONSE FUNCTIONS [J].
NELDER, JA .
BIOMETRICS, 1966, 22 (01) :128-&
[8]   THE EFFECT OF VARIOUS SAMPLING INTERVALS ON THE ESTIMATION OF LACTATION MILK YIELD AND COMPOSITION [J].
OCONNOR, LK ;
LIPTON, S .
JOURNAL OF DAIRY RESEARCH, 1960, 27 (03) :389-398
[9]   The analysis of the lactation curve into maximum yield and persistency [J].
Sanders, HG .
JOURNAL OF AGRICULTURAL SCIENCE, 1930, 20 :145-185
[10]   REGRESSION FACTORS FOR EXTENDING PART LACTATION MILK RECORDS [J].
VANVLECK, L ;
HENDERSON, CR .
JOURNAL OF DAIRY SCIENCE, 1961, 44 (06) :1085-&