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Combination of legume-based herbage and total mixed ration (TMR) maintains intake and nutrient utilization of TMR and improves nitrogen utilization of herbage in heifers

Published online by Cambridge University Press:  11 October 2016

A. Santana ,
C. Cajarville ,
A. Mendoza  and
J. L. Repetto
A. Santana
Affiliation:
Departamento de Producción de Bovinos, Facultad de Veterinaria, Universidad de la República, Ruta 1, Km 41.500, San José, Uruguay
C. Cajarville*
Affiliation:
Departamento de Nutrición Animal, Facultad de Veterinaria, Universidad de la República, Ruta 1, Km 41.500, San José, Uruguay
A. Mendoza
Affiliation:
Departamento de Producción de Bovinos, Facultad de Veterinaria, Universidad de la República, Ruta 1, Km 41.500, San José, Uruguay
J. L. Repetto
Affiliation:
Departamento de Producción de Bovinos, Facultad de Veterinaria, Universidad de la República, Ruta 1, Km 41.500, San José, Uruguay
*
†E-mail: [email protected]
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Abstract

Diets combining herbage and total mixed rations (TMR) are increasingly used in temperate regions for feeding ruminants, but little information is available regarding the effects on nutrient intake and digestion of this feeding management in beef cattle. The aim of this study was to determine the effects of combining TMR (10% CP and 13% ADF), and legume-based herbage (14% CP and 27% ADF) on intake, nutrient digestion, ruminal fermentation, microbial N flow and glucose and nitrogen metabolism in heifers. The experiment was a 3×3 Latin square design replicated three times; each period lasted 18 days (10 adaptation days and 8 measurement days). Nine cross-bred (Aberdeen Angus×Hereford) heifers (214±18 kg) fitted with permanent rumen catheters and housed in individual metabolic cages were assigned to one of three treatments: 24 h access to TMR (T), 24 h access to herbage (H) or combined diets with 18 h access to TMR and 6 h access to herbage (T+H). Data were evaluated using a mixed model. Animals fed T+H (TMR 71% and herbage 29%) diets tended to have a higher dry matter intake as a proportion of their BW than animals fed T. The T+H diet did not change ruminal fermentation (pH, N–NH3 and volatile fatty acids) or the N metabolism relative to the T diet, but increased the glucagon concentration and altered glucose metabolism. Conversely, animals fed T+H had increased purine derivatives excretion, increased N use efficiency for microbial protein synthesis and decreased plasma urea and urinary N excretion relative to animals fed H diet. The use of combined diets led to consumption of nutrients similar to a TMR diet, without reducing nutrient use and could improve N utilization compared with the herbage-only diet.

Keywords

partial mixed rationmixed dietspasturefeeding systemmicrobial protein synthesis
Type
Research Article
Information
animal , Volume 11 , Issue 4 , April 2017 , pp. 616 - 624
Copyright
© The Animal Consortium 2016 

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