ANSC 24500 Lecture 7: Reading Assignment 7

• School: Purdue University
• Department: Animal Sciences
• Course: ANSC 24500
• Professor: Michael Neary

Document Summary

Factors affecting expression of estrus: influence of herd mates, social interactions, number of animals in estrus, synchronized vs spontaneous, environmental temp, breed, footing surface, feet and leg problems, nutrition and level of milk production. Estrus detection aids: patches, heatwatch electron estrus detection system, crayons/paint. When to inseminate relative to onset of estrus: am/pm rule, estrus in am, breed in pm, estrus in pm, breed in am, most consistent pregnancy. Events associated with estrus and fertilization: estrus, 15h (6-24 hours, estrus to lh surge, 2-6 hours, estrus to ovulation, 27 hours (24-32, life span, sperm 24-30 hours, oocyte 6-10 hours. Artificial insemination: look for animals being mounted, average estrous is 18 hours, standing heat - ovulate for 30 hours, inseminate 12 hours after observing in standing heat, practice placing the semen. How to tag livestock properly: secure the animal, limit the animal"s head movement. Between upper and lower ribs: too far outside .