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Performance of lactating dairy cows fed varying levels of total mixed ration and pasture

Published online by Cambridge University Press:  14 August 2008

Ronaldo E Vibart ,
Vivek Fellner ,
Joseph C Burns ,
Gerald B Huntington  and
James T Green Jr
Ronaldo E Vibart
Affiliation:
Department of Animal Science, North Carolina State University, Raleigh, NC 27695–7621USA
Vivek Fellner*
Affiliation:
Department of Animal Science, North Carolina State University, Raleigh, NC 27695–7621USA
Joseph C Burns
Affiliation:
Department of Animal Science, North Carolina State University, Raleigh, NC 27695–7621USA USDA–ARS and Department of Crop Science, North Carolina State University, Raleigh, NC 27695–7621USA
Gerald B Huntington
Affiliation:
Department of Animal Science, North Carolina State University, Raleigh, NC 27695–7621USA
James T Green Jr
Affiliation:
USDA–ARS and Department of Crop Science, North Carolina State University, Raleigh, NC 27695–7621USA
*
†For correspondence; e-mail: [email protected]
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Abstract

Two, 8-week experiments, each using 30 lactating Holstein cows, were conducted to examine performance of animals offered combinations of total mixed ration (TMR) and high-quality pasture. Experiment 1 was initiated in mid October 2004 and Experiment 2 was initiated in late March 2005. Cows were assigned to either a 100% TMR diet (100:00, no access to pasture) or one of the following three formulated partial mixed rations (PMR) targeted at (1) 85% TMR and 15% pasture, (2) 70% TMR and 30% pasture and (3) 55% TMR and 45% pasture. Based on actual TMR and pasture intake, the dietary TMR and pasture proportions of the three PMR in Experiment 1 were 79% TMR and 21% pasture (79:21), 68% TMR and 32% pasture (68:32), and 59% TMR and 41% pasture (59:41), respectively. Corresponding proportions in Experiment 2 were 89% TMR and 11% pasture (89:11), 79% TMR and 21% pasture (79:21) and 65% TMR and 35% pasture (65:35), respectively. Reducing the proportion of TMR in the diets increased pasture consumption of cows on all PMR, but reduced total dry matter intake compared with cows on 100:00. An increase in forage from pasture increased the concentration of conjugated linoleic acids and decreased the concentration of saturated fatty acids in milk. Although milk and milk protein yields from cows grazing spring pastures (Experiment 2) increased with increasing intakes of TMR, a partial mixed ration that was composed of 41% pasture grazed in the fall (Experiment 1) resulted in a similar overall lactation performance with increased feed efficiency compared to an all-TMR ration.

Keywords

Intakepasturepartial mixed rationgrazing
Type
Research Article
Information
Journal of Dairy Research , Volume 75 , Issue 4 , November 2008 , pp. 471 - 480
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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