title: Lactational responses to postruminal administration of proteins and amino acids.
abstract: Rumen by-pass of nutrients has improved performance of lactating dairy cows, growing stepers, and sheep. Postruminal supplementation of casein has increased milk production 1 to 4 kg per cow per day and milk protein yield by 10 to 15%. Component(s) in casein eliciting the improved performance have not been determined adequately. Glucose, amino acids, hormone secretion, or a combination of these factors may be responsible for the improved performance. Future research to delineate limiting nutrients for postruminal supplementation should prove fruitful and should make a major contribution to improved production by ruminant animals.
mesh_terms: D000018:Abomasum / Q000378:metabolism; D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D002364:Caseins / Q000378:metabolism*; D002417:Cattle / Q000378:metabolism*; D004044:Dietary Proteins / Q000008:administration & dosage; D005260:Female; D005947:Glucose / Q000378:metabolism; D006728:Hormones / Q000502:physiology; D007774:Lactation; D008297:Male; D008321:Mammary Glands, Animal / Q000378:metabolism; D008715:Methionine / Q000378:metabolism; D008892:Milk / Q000378:metabolism; D008894:Milk Proteins / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D011247:Pregnancy; D012417:Rumen / Q000378:metabolism; D012756:Sheep
chemical_list: D000596:Amino Acids; D002364:Caseins; D004044:Dietary Proteins; D006728:Hormones; D008894:Milk Proteins; D008715:Methionine; D005947:Glucose; D009584:Nitrogen