« Previous Abstract"Effect of extreme walking conditions for dairy cows on milk yield, chemical composition, and somatic cell count"    Next AbstractMild effects of gestational stress and social reactivity on the onset of mother-young interactions and bonding in sheep »

J Dairy Res

Title:		Effect of genetic potential and level of feeding on milk protein composition
Author(s):		Coulon JB; Dupont D; Pochet S; Pradel P; Duployer H;
Address:		"Unite' de Recherches sur les Herbivores, INRA, Theix, Saint-Genes-Champanelle, France. jbc@clermont.inra.fr"
Journal Title:		J Dairy Res
Year:		2001
Volume:		68
Issue:		4
Page Number:		569 - 577
DOI:		10.1017/s002202990100512x
ISSN/ISBN:		0022-0299 (Print) 0022-0299 (Linking)
Abstract:		"Two groups of 15 multiparous cows in mid-lactation were used in a Latin square design experiment with 4-week experimental periods. The genetic milk protein concentration level was high in the first group and low in the second. Each group of cows was given in a random order three feeding levels that covered 85, 100 and 115% of energy requirements and 90, 110 and 125% of nitrogen requirements, respeetively. In both groups, increasing level of feeding induced a significant increase in milk yield (+ 2.4 kg/d between lowest and highest levels) and in protein concentration (+ 1.7 g/kg). The proportion of paracasein in total proteins was not altered by either genetics or nutrition. The proportion of casein in total proteins was slightly increased by 0.5 percentage points (P < 0.05) with the intermediate level of feeding. Plasmin and plasminogen activities were not significantly modified by the genetic milk concentration level. Plasmin activity significantly increased with nutrient supplementation, but only in animals of low genetic potential (+ 21% between low and high levels, P < 0.01). Casein composition was not significantly altered by the genetics or level of nutrition. Over the whole range of individual measurements taken (n = 90), the relationships between casein or paracasein and total protein concentrations were linear and very narrow (R2 = 0.92 and 0.95, respectively). The proportion of casein or paracasein in total proteins significantly decreased as plasmin activity increased"
Keywords:		*Animal Nutritional Physiological Phenomena Animals Caseins/analysis Cattle/*genetics/*physiology Diet Energy Intake Female Fibrinolysin/analysis Lactation Milk Proteins/*analysis Plasminogen/analysis;
Notes:		"MedlineCoulon, J B Dupont, D Pochet, S Pradel, P Duployer, H eng Research Support, Non-U.S. Gov't England 2002/04/04 J Dairy Res. 2001 Nov; 68(4):569-77. doi: 10.1017/s002202990100512x"