Download Reproductive Traits and Hormones in Livestock: Facts and Myths and more Quizzes Animal Biology in PDF only on Docsity! TERM 1 True DEFINITION 1 In general, lowly geritable traits exhibit a greater amount of heterosis than highly heritable ones T/F? TERM 2 False DEFINITION 2 Relaxin causes relaxation of the cervix during estrus to allow sperm to move through the cervix into the uterus for fertilization TERM 3 False DEFINITION 3 Lobules are the basic secretory unit of the udder TERM 4 True DEFINITION 4 In the female reproductive tract, the fertile life of the ova is usually shorter than that of the sperm TERM 5 False DEFINITION 5 The sigmoid flexure can be found in the ram, buck, and bull but not in the stallion or boar TERM 6 True DEFINITION 6 Iodine is necessary for proper funciton of the thyroid hormones TERM 7 True DEFINITION 7 A terminal crossbreeding program has more heterosis compraed to a rotational crossbreeding program TERM 8 False DEFINITION 8 The hormone responsible form maintaining pregnancy, Prostaglandin, is produced by both the placenta and the corpus luteum in cattle and pigs TERM 9 True DEFINITION 9 Pigs have a digestive system very similar to humans which make them excellent models for studying nutritional deficiencies TERM 10 False DEFINITION 10 US dairy cow numbers and total milk production have declined since the mid 1970's TERM 21 True DEFINITION 21 The front 21/4s of the dairy cow contribute 40% of the milk produced by the udders TERM 22 False DEFINITION 22 It is important for the dairy calf to stay with its mother for the first seven days of its life in order to ensure that adequate colostrums intake occurs TERM 23 True DEFINITION 23 In the female reproductive tract, the fertile life of the oca is usually shorter than that of the sperm TERM 24 True DEFINITION 24 There is normally no exchange of milk between the 4 1/4s of the udder TERM 25 False/True??? DEFINITION 25 A ROT, beef and dairy heifers should be bred after they have attained 65% of their mature weight TERM 26 True DEFINITION 26 An incomplete milking of a dairy cow can cause a decline in milk production TERM 27 True DEFINITION 27 Estrumate, a prostaglandin-based synchronization drug, requires multiple injections to synchronize the entire cow herd TERM 28 Flase DEFINITION 28 Estrogen is the hormone responsible for alveolar development in the mammary gland TERM 29 False DEFINITION 29 Increasing the amount of roughage fed to a dairy cow will increase the amount of acetate produced in the rumen which will reduce milk fat levels TERM 30 False DEFINITION 30 Approximately 20% more milk will be obtained with 4 times a day milking compared to 3 times a day milking TERM 31 True DEFINITION 31 MIlk production will tend to be lower in dairy cows that calve during April and May compared to cows calving iduring October and November TERM 32 True DEFINITION 32 There is normally no exchange of milk between the four quearters of the cow's udder
