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Forage to concentrate ratio in Jonica breed goats: influence on lactation curve and milk composition

Published online by Cambridge University Press:  19 January 2009

Vincenzo Tufarelli ,
Marco Dario  and
Vito Laudadio
Vincenzo Tufarelli
Affiliation:
Department of Animal Health and Welfare, Faculty of Veterinary Medicine, University of Bari, Valenzano70010, Italy
Marco Dario
Affiliation:
Department of Animal Health and Welfare, Faculty of Veterinary Medicine, University of Bari, Valenzano70010, Italy
Vito Laudadio*
Affiliation:
Department of Animal Health and Welfare, Faculty of Veterinary Medicine, University of Bari, Valenzano70010, Italy
*
*For correspondence; e-mail: v.laudadio@veterinaria.uniba.it
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Abstract

The aim of the work is to evaluate the effects of different forage to concentrate rations on milk yield, composition and renneting properties of milk of Jonica breed goats. Twenty-four Jonica goats received diets with forage to concentrate ratio of 35/65, 50/50 or 65/35, providing respectively a low, medium and high energy level. Goats were divided into three homogenous groups and confined in individual pens for 152 days to assess the daily feed intake and milk yield and composition. The main conclusions show that animal body weight did not change significantly with the increasing levels of forage, whereas significant differences (P<0·05) for daily dry matter intake were observed in relation to the evolution of lactation. Milk production was influenced (P<0·05) by dietary treatments and was higher in the diet with the greatest energy level. Forage to concentrate ratios did not significantly affect milk characteristics, milk renneting properties, initial production, rate of increase until reaching the peak and rate of decline after peak production. However, the day of peak production and peak production of goats were linearly reduced when the level of forage increased within the diet. In conclusion, the results indicate that both forage to concentrate ratio and energy level improve goat's production without influencing the milk composition.

Keywords

Goatforage to concentrate ratiomilk compositionlactation curve
Type
Research Article
Information
Journal of Dairy Research , Volume 76 , Issue 1 , February 2009 , pp. 124 - 128
Copyright
Copyright © Proprietors of Journal of Dairy Research 2009

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