Dairy Cattle Breeding Terms and Definitions, Quizzes of Animal Biology

Download Dairy Cattle Breeding Terms and Definitions and more Quizzes Animal Biology in PDF only on Docsity! TERM 1 production life DEFINITION 1 time in milking herd before removal by voluntary culling, involuntary culling, or death; credits for each month in milk obtained from standard lactation curves and then summed across all lactations TERM 2 heifer conception rate DEFINITION 2 Percentage of inseminated heifers that become pregnant at each service. TERM 3 cow first insemination (CFI) DEFINITION 3 oLactatings cow ability to start cycling defined as days from calving to first insemination TERM 4 cow conception rate (CCR) DEFINITION 4 oPercentage of inseminated cows that become pregnant at each service TERM 5 daughter pregnancy rate (DPR) DEFINITION 5 oLactating cows calving to conception interval defines as the percentage of non-pregnant cows that become pregnant during each 21 day period TERM 6 % difficult births heifers DEFINITION 6 oExpressed as a percentage of births of bull calves that are difficult in first-calf heifers TERM 7 % stillbirths DEFINITION 7 oPercentage of births of bull calves that are stillborn in first- calf heifers TERM 8 direct calving ease DEFINITION 8 Relative ease with which an individuals calves are born to first-calf heifers compared to all other individuals evaluated in a breed. TERM 9 maternal calving ease DEFINITION 9 Relative ease with which an individuals daughters calves are born compared to all other individuals evaluated in a breed. TERM 10 gestation length DEFINITION 10 Expected difference in average gestation length (expressed in days) of an individuals calves as compared to all other individuals evaluated in a breed. TERM 21 docility DEFINITION 21 expressed as a difference in yearling cattle temperament, with a higher value indicating more favorable docility. TERM 22 number born alive DEFINITION 22 The number of live pigs farrowed in a litter, adjusted for parity of the sow TERM 23 number weaned DEFINITION 23 The number of pigs that a dam raised to 21 days of age, adjusted for parity and number after transfer TERM 24 21 day litter weight DEFINITION 24 Litter weight adjusted to 21 days of age TERM 25 days to 250 lbs DEFINITION 25 Estimated days to reach 250 pounds TERM 26 pounds of lean DEFINITION 26 Pounds of fat-free lean adjusted to a 185 pound carcass or approximately a 250 pound live pig TERM 27 backfat thickness DEFINITION 27 Backfat thickness measured ultrasonically in inches, adjusted to 250 pounds live weight. TERM 28 feed/gain DEFINITION 28 Pounds of feed consumed per pound of gain TERM 29 TSI DEFINITION 29 terminal sire index TERM 30 SPI DEFINITION 30 sow productivity index TERM 31 MLI DEFINITION 31 maternal line index TERM 32 correlated response to selection DEFINITION 32 Genetic change in one or more traits resulting from selection for another TERM 33 pleiotropy DEFINITION 33 A single gene affects more than one trait TERM 34 genetic correlation DEFINITION 34 A measure of the strength of the relationship between breeding values for one trait and breeding values of another trait. Also a measure of pleiotrophy. TERM 35 phenotypic correlation DEFINITION 35 A measure of the strength of the relationship between performance for one trait and performance in another trait.