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Milk production in dairy goats supplemented with different levels of ruminally protected methionine

Published online by Cambridge University Press:  06 April 2016

Erick Alonso-Mélendez ,
Germán D. Mendoza ,
Francisco A. Castrejón-Pineda  and
Andrés E. Ducoing-Watty
Erick Alonso-Mélendez
Affiliation:
Maestría en Ciencias de la Producción y de la Salud Animal, Universidad Nacional Autónoma de México, México D.F., 04510, México
Germán D. Mendoza*
Affiliation:
Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana, Unidad Xochimilco, México D.F. 04960, México
Francisco A. Castrejón-Pineda
Affiliation:
Maestría en Ciencias de la Producción y de la Salud Animal, Universidad Nacional Autónoma de México, México D.F., 04510, México
Andrés E. Ducoing-Watty
Affiliation:
Maestría en Ciencias de la Producción y de la Salud Animal, Universidad Nacional Autónoma de México, México D.F., 04510, México
*
*For correspondence; e-mail: [email protected]
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Abstract

The objective of the study reported in this Research Communication was to evaluate graded levels of ruminally protected methionine (RPM) in dairy goat rations on milk production and live weight changes during 155 d of lactation. Twenty-five primiparous dairy goats (crosses of Toggenburg, French Alpine and Saanen; 45·4 ± 1·0 kg BW) were fed a basal diet (10·10% CP, 6·13 DP and 2·34 Mcal/kg ME) of corn silage, oat hay, alfalfa hay and concentrate (80% forage, 20% concentrate). After kidding, the treatments, which consisted of four oral doses of ruminally protected methionine (RPM) at 0, 1, 2 and 3 g/d, were randomly assigned to the goats. The experiment was conducted for 110 d with measurements of milk production and composition, body weight and dry matter intake. No treatment effects were detected in milk production and composition. However, goats with RPM showed a positive live weight changes during lactation which were improved as dose was increased (linear P < 0·01) whereas goats without RPM showed weight loss during the experiment.

Keywords

Methioninegoatmilk production
Type
Research Article
Information
Journal of Dairy Research , Volume 83 , Issue 2 , May 2016 , pp. 148 - 150
Copyright
Copyright © Proprietors of Journal of Dairy Research 2016 

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