Journal article

Effect of type of diet and energy intake on milk production of Holstein-Friesian cows with extended lactations

C Grainger, MJ Auldist, G O'Brien, KL Macmillan, C Culley

JOURNAL OF DAIRY SCIENCE | ELSEVIER SCIENCE INC | Published : 2009

Abstract

The aim of this study was to measure the effect of type of diet and level of energy intake on the performance of cows undergoing extended lactations. Ninety-six Holstein-Friesian cows that calved in July and August 2004 were assigned randomly to 1 of 8 groups each of 12 cows (including 4 primiparous cows). Two of the 8 groups were assigned to each of 4 treatments that varied in lactation length (300 or 670 d) and diet (3 diets: control, high, or full total mixed ration (TMR). The 4 treatments were 1) control 300: cows were managed for a 300-d lactation and grazed pasture supplemented with grain and forage to provide a minimum daily dietary intake of 160 MJ of ME/cow; 2) control 670: as for c..

View full abstract