Influence of niacin and whole cottonseed on intake, milk yield and composition, and systemic responses of dairy cows

Twenty-four Holstein cows (early postpartum) were used in a randomized complete block design with a 2 X 2 factorial arrangement of treatments to compare effects of nicotinic acid (niacin) and whole cottonseed. Cows were fed individually isonitrogenous complete mixed rations ad libitum, containing co...

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Bibliographic Details
Published in:Journal of dairy science 1986-12, Vol.69 (12), p.3087-3093
Main Authors: Horner, J.L, Coppock, C.E, Schelling, G.T, Labore, J.M, Nave, D.H
Format: Article
Language:English
Subjects:
Animals
BOVIN LAITIER
Cattle - metabolism
COMPLEMENT ALIMENTAIRE
COMPOSICION
COMPOSITION
Cottonseed Oil - pharmacology
COWS
DAIRY CATTLE
DIET
DIETA
Dietary Fats - pharmacology
FEED INTAKE
FEED SUPPLEMENTS
Female
FOOD INTAKE
GANADO DE LECHE
GLUCOSA
GLUCOSE
GOSSYPIUM
GRAINE
INGESTION DE ALIMENTOS
INGESTION DE PIENSO
INSULIN
INSULINA
INSULINE
Lactation - drug effects
LAIT
LECHE
MILK
Milk - analysis
MILK YIELD
Niacin - pharmacology
NICOTINAMIDA
NICOTINAMIDE
Pregnancy
PRISE ALIMENTAIRE
PRISE ALIMENTAIRE (ANIMAUX)
REGIME ALIMENTAIRE
RENDEMENT LAITIER
RENDIMIENTO LECHERO
SEEDS
SEMILLA
SUPLEMENTOS DE PIENSOS
TRIPTOFANO
TRYPTOPHAN
Tryptophan - blood
TRYPTOPHANE
VACA
VACHE
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Summary:Twenty-four Holstein cows (early postpartum) were used in a randomized complete block design with a 2 X 2 factorial arrangement of treatments to compare effects of nicotinic acid (niacin) and whole cottonseed. Cows were fed individually isonitrogenous complete mixed rations ad libitum, containing corn-soy concentrate, corn silage, chopped coastal bermudagrass hay, and either 1) 0% niacin and 0% whole cottonseed, 2) 0% niacin and 15% whole cottonseed, 3) .03% niacin and 0% whole cottonseed, or 4) .03% niacin and 15% whole cottonseed. Dry matter and energy consumption, actual milk yield, total milk solids, and milk fat yield were not affected by treatment. Either niacin or whole cottonseed increased milk fat percentage and 4% fat-corrected milk. Milk protein percentage and yield were higher with niacin supplementation but tended to be lower with cottonseed feeding. The milk protein depression with whole cottonseed was alleviated by niacin due to stimulation of mammary casein synthesis. Supplemental niacin tended to elevate glucose and insulin in blood plasma, but whole cottonseed tended to reduce these plasma components. Plasma urea nitrogen was higher in cows fed whole cottonseed. Plasma-free tryptophan tended to be slightly higher in cows receiving supplemental niacin.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.s0022-0302(86)80771-8