Carbohydrates and protein digestive traits in beef cattle grazing fertilised or mixed tropical pasture.
Arch Anim Nutr
; 78(1): 60-77, 2024 Feb.
Article
en En
| MEDLINE
| ID: mdl-38488818
ABSTRACT
This study was performed to investigate the nitrogen (N) and carbohydrate digestive traits of grazing heifers. The experiment was carried out at the Federal University of Lavras. The treatments were a Marandu palisadegrass (Urochloa brizantha [Syn, Brachiaria brizantha] Stapf. A. Rich. cv. Marandu) monoculture fertilised with 150 kg N/[ha â year] (FP) or Marandu palisadegrass mixed pasture with forage peanut (MP). The pastures were grazed by six rumen-cannulated zebu heifers. A double cross-over design was used in four periods. Nutritive value, intake and apparent digestibility of forage, ruminal traits and kinetics and N balance were evaluated. Apparent total-tract digestibility of dry matter (DM) and neutral detergent fibre (NDF) were greater for FP than for MP. There was no effect in apparent total-tract digestibility of N. The estimated intestinal digestibility of nutrients was greater on MP than FP. Even though N intake and faecal N output were greater on MP than FP, there was no effect in urine N output. The N balance tended to be greater on MP than FP. The forage peanut, which contains condensed tannins, decreased ruminal fibre degradation, apparent digestibility and ruminal protein degradation, increased N flow from the rumen. Inclusion of forage peanut in the mixed pasture decreased the ruminal fibre degradability but increased N retention by the animals.
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Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Rumen
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Dieta
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Digestión
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Alimentación Animal
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Fenómenos Fisiológicos Nutricionales de los Animales
Límite:
Animals
Idioma:
En
Revista:
Arch Anim Nutr
Año:
2024
Tipo del documento:
Article
País de afiliación:
Brasil