Effect of culling reasons on lifetime profitability measures of dairy cows in Kentucky

Revista Brasileira de Zootecnia

McAllister, Alan Jack¹  Queiroz, Sandra Aidar de²  Ribeiro, Anamaria Cândido³ 

[1] University of Kentucky;UNESP, Jaboticabal;CREUPI, Espírito Santo do Pinhal

关键词: dairy cattle;    productive life;    profitability;    net income    Introdução O objetivo primário da maior parte dos produtores de leite deveria ser maximizar os lucros;    ou seja;    tornar a atividade economicamente eficiente e lucrativa;   

DOI  :  10.1590/S1516-35982003000700025

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The aims of this research were to evaluate the effect of culling reasons on lifetime economic measures of dairy cows especially, Lifetime Net Income (LNI), Lifetime efficiency (LE), Income Over Feed Costs (IOFC) and Lifetime income per day of productive life (LIPL) using 19,565 lifetime records from Holstein cows. Culling rate was calculated dividing the number of culled animals, yearly, by the number of all animals present in each year. Data on reasons for disposal were used to calculate the culling rate distribution, dividing the number of animals in each class of culling reason by the total number of animals. The estimated culling rate was 31.39%. This value was high and could be a result from the short productive life of cows, 25.57 months. The main reasons for disposal were reproductive problems (21.57%), injuries and other causes (21.17%), and low production (17.20%). Involuntary culling was responsible for the majority of culling, representing 75% of total. All traits were significantly affected by culling reason. Cows culled for dairy purposes were more profitable to producers.

【 授权许可】

CC BY-NC