Plasma very low density lipoproteins, abdominal fat lipase, and @entity1386 during rearing in two strains of broiler XXXX .

@entity1568 @entity37768 @entity22705 @entity1573 @entity1386
Experimental control Strains 30, representative of commercial broiler dam stocks in the late 1970's, and K, representative of commercial broiler stocks of 20 years earlier, were compared. Development of carcass @entity1386 and related traits and physiological traits from 3 to 17 weeks of age were studied. About 12 @entity1573 of mixed sex of each strain were bled and killed at 2-week intervals beginning at 3 weeks of age for measurement of traits. From 3 to 17 weeks of age, percentage abdominal fat of carcass, carcass fat (ether extract) and plasma very low density lipoproteins ( @entity37768 ) increased with age. Percentage carcass @entity1568 , ash, and water, lipase activity of abdominal fat expressed per mg protein or per g of fat ( @entity22705 /g F), and protein concentration of the abdominal fat enzyme preparation (P/ml EPrep) decreased with age. Strain 30 had a higher percentage of abdominal fat and carcass fat, but less carcass @entity1568 , ash, and water than Strain K, although there were interactions with sex and age. For physiological traits, Strain 30 had more @entity22705 /g F and less P/ml EPrep than Strain K. Males had lower percentages of abdominal fat, carcass fat, and plasma @entity37768 , and higher percentages of carcass @entity1568 , ash, and water than females. There were no significant differences between sexes for the other physiological traits. There were significant (P less than .01) partial correlations between plasma @entity37768 and percentage abdominal fat (.22), and between P/ml EPrep and percentages of abdominal fat (-.25), carcass fat (-.29), carcass @entity1568 (.30), and carcass water (.30). These observations in conjunction with multiple regression analyses indicated that, in addition to plasma @entity37768 , protein concentration of adipose tissue expressed as P/ml EPrep might be a useful predictor of @entity1386 in @entity1573 .
