Effect of stage of lactation and dietary starch content on endocrine-metabolic status, blood amino acid concentrations, milk yield, and composition in Holstein dairy cows
F. Piccioli-Cappelli, C. J. Seal, D.S. Parker, Juan J. Loor, Andrea Minuti, Vincenzo Lopreiato, Erminio Trevisi
Abstract
C] Leu in early lactation suggested lower protein retention in peripheral tissues during early compared with late lactation. Milk yield, protein output, and composition were similar between groups at both stages of lactation, whereas milk coagulation was faster (lower curd firming rate) and with higher curd firmness in response to feeding HS in late lactation. Overall, data indicated that rate of carbohydrate fermentability in the rumen can modify the availability of metabolites to the mammary gland and consequently modify milk protein coagulation.
Topics & Concepts
LactationDry matterChemistryAnimal scienceComposition (language)CaseinRumenDairy cattleInsulinStarchFood scienceEndocrinologyInternal medicineBiologyPregnancyMedicinePhilosophyGeneticsFermentationLinguisticsRuminant Nutrition and Digestive PhysiologyReproductive Physiology in LivestockGenetic and phenotypic traits in livestock