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Mammary gland development of dairy heifers fed diets containing increasing levels of metabolisable protein: metabolisable energy

Published online by Cambridge University Press:  16 January 2015

Ronan L Albino ,
Marcos I Marcondes ,
Robert M Akers ,
Edenio Detmann ,
Bruno C Carvalho  and
Tadeu E Silva
Ronan L Albino*
Affiliation:
Animal Science Department, Federal University of Viçosa, Viçosa, Minas Gerais 36571-000, Brazil
Marcos I Marcondes
Affiliation:
Animal Science Department, Federal University of Viçosa, Viçosa, Minas Gerais 36571-000, Brazil
Robert M Akers
Affiliation:
Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA
Edenio Detmann
Affiliation:
Animal Science Department, Federal University of Viçosa, Viçosa, Minas Gerais 36571-000, Brazil
Bruno C Carvalho
Affiliation:
Embrapa Gado de Leite, Juiz de Fora, Minas Gerais 36038-330, Brazil
Tadeu E Silva
Affiliation:
Embrapa Gado de Leite, Juiz de Fora, Minas Gerais 36038-330, Brazil
*
*For correspondence; e-mail: [email protected]
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Abstract

This study was conducted to evaluate the development of the mammary gland in Holstein heifers subjected to different dietary metabolisable protein (MP): metabolisable energy (ME) ratios. Twenty-five Holstein heifers (initial body weight (BW) 213±13·5 kg and initial average age 7·8±0·5 months) were divided into five treatments. The treatments were designed to provide MP:ME ratios equal to 33, 38, 43, 48, and 53 g of MP per Mcal of ME. All diets were formulated to have the same energy content (2·6 Mcal ME/kg dry matter). Actual MP:ME ratios were 36·2, 40·2, 46·2, 47·1, and 50·8 g MP/Mcal ME. The experiment was conducted in a randomised block design, while considering initial BW as a blocking factor to evaluate pre- and post-pubertal periods. Block effect was not observed for all variables evaluated; hence it was considered that the diets had the same influence both on pre- and post-pubertal phases. Dry matter and nutrient intake did not change between treatments, excepting protein intake and digestibility. Serum concentrations of insulin-like growth factor 1 increased linearly across treatments. Changes in the pixel brightness of mammary gland ultrasound images, which are associated with lipid content, were significantly influenced by MP:ME ratios in the diet of heifers that were subjected to accelerated growth rates. It is not recommended to use diets of less than 38 g MP/Mcal ME in diets to heifers allowed to gain more than 1 kg/d.

Keywords

Heifermammary glandultrasound
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 1 , February 2015 , pp. 113 - 120
Copyright
Copyright © Proprietors of Journal of Dairy Research 2015 

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