Effects of niacin and whole cottonseed on ruminal fermentation, protein degradability, and nutrient digestibility

Four mature nonlactating Holstein heifers fitted with ruminal and duodenal cannulae were used to investigate in vivo effects of niacin and whole cottonseed. Each heifer was assigned randomly to a treatment in a 2 X 2 factorial arrangement of treatment sequences within a 4 X 4 Latin square design. He...

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Bibliographic Details
Published in:Journal of dairy science 1988-05, Vol.71 (5), p.1239-1247
Main Authors: Horner, J.L, Coppock, C.E, Moya, J.R, Labore, J.M, Lanham, J.K
Format: Article
Language:English
Subjects:
Animals
BOVIN LAITIER
Cattle - metabolism
COMPLEMENT ALIMENTAIRE
Cottonseed Oil - pharmacology
COWS
DAIRY CATTLE
DEGRADATION
DETERIORO
Dietary Proteins - metabolism
DIGESTIBILIDAD
DIGESTIBILITE
DIGESTIBILITY
Digestion - drug effects
FARINE D'OLEAGINEUX
FEED INTAKE
FEED SUPPLEMENTS
Female
FERMENTACION
FERMENTATION
Fermentation - drug effects
GANADO DE LECHE
HARINA OLEAGINOSA
INGESTION DE PIENSO
Niacin - pharmacology
NICOTINAMIDA
NICOTINAMIDE
NUTRIENTES
NUTRIENTS
OIL MEALS
PRISE ALIMENTAIRE (ANIMAUX)
PROTEINAS
PROTEINE
PROTEINS
RUMEN
Rumen - drug effects
SUBSTANCE NUTRITIVE
SUPLEMENTOS DE PIENSOS
VACA
VACHE
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Summary:Four mature nonlactating Holstein heifers fitted with ruminal and duodenal cannulae were used to investigate in vivo effects of niacin and whole cottonseed. Each heifer was assigned randomly to a treatment in a 2 X 2 factorial arrangement of treatment sequences within a 4 X 4 Latin square design. Heifers were fed isonitrogenous complete mixed rations individually twice daily. Diets contained corn-soybean meal concentrate, corn silage, chopped coastal bermudagrass hay, plus 1) 0% niacin and 0% whole cottonseed, 2) 0% niacin and 15% whole cottonseed, 3) .07% niacin and 0% whole cottonseed, or 4) .07% niacin and 15% whole cottonseed. Dry matter consumption, ruminal pH, ruminal ammonia and VFA concentrations, microbial N production, and DM and ADF digestion were not affected by treatment. Numbers of ruminal protozoa and RNA concentrations were reduced with whole cottonseed feeding and increased by addition of niacin. Whole cottonseed increased molar percentages of acetate while depressing propionate. Niacin supplementation resulted in greater digestion of both CP and NDF. Ether extract digestibility was highest in heifers fed whole cottonseed. Fiber digestion was not affected by whole cottonseed feeding.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(88)79679-4