ANSC 101 Lecture Notes - Lecture 9: Dairy Cattle, White Adipose Tissue, Humerus

• School: University of Maryland
• Department: Animal Science
• Course: ANSC 101
• Professor: Kasey Moyes

Document Summary

Percent of phenotypic variation due to breeding value. Dairy cattle: services (matings) per conception 5, mature weight 50, milk production 25, mastitis 10% Selection differential: difference between selected animals and herd averages. Genetic change (heritability x selection differential) / generation interval. Generation interval: average age of parents when offspring are born, swine 2 years, beef cows 6 years, dairy cows 3 years. Why should we understand the mechanisms of growth and development. To be able to improve the growth rate of domestic animals and improve efficiency. To be able to improve the quality of the carcasses and meat. Growth: increase in body weight, height, length, and girth due to increase in mass of structural tissues and organs. Development: the directed coordination of all processes (growth, cell differentiation, body shape, and form) until maturity is reached. Environment: nutrition, climate/attitude, diseases and parasites, hormonal regulation, immune response, physiological status. Hyperplasia: increase in cell number, increase cell mitosis (division, 2 types.