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Reproduction and Palpation
4-H Veterinary ScienceExtension Veterinary Medicine
Texas AgriLife Extension ServiceCollege of Veterinary Medicine and Biomedical Science
Texas A&M Systemhttp://aevm.tamu.edu
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Objectives
Describe the estrous cycle Describe breeding soundness examination of
female animals Discuss breeding soundness examination of
male animals Describe procedures for pregnancy
diagnosis, including rectal palpation techniques
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Definitions Ovum
An egg produced by the ovary Sperm
Male germ cell produced by the testes Follicle
Blister on the ovary that forms as the ovum prepares to burst out at ovulations
Semen Fluid produced by the male accessory sex gland
Corpus luteum A tissue body produced by the ovary from the remains of the
ruptured follicle after ovulation Ejaculate
A mixture of sperm and semen, released during ejaculation
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Estrous Length of the cycle
Estrus When animal is in heat Sexual receptivity
5 d7 d21 dHorse
24-30 h30 h17 dSheep
36-44 h50 h21 dPig
24-32 h15 h21dCattle
Estrus to Ovulation
Duration of Estrus
Length of Estrous
Species
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Normal Cycle
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Breeding Soundness
Cow Rectal palpation
Ovaries Activity Follicles Corpus lutea
Uterus Cervix
Rectal Ultrasound
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Bull External palpation
Testes Size Temperature Texture
Epididymis Rectal palpation
Accessory sex glands
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Pregnancy Evaluation
Rectal or ultrasound examination Locate embryo/fetus
Age of fetus Vesicle size Uterine horn Fetus Fetal membranes Cotyledons Uterine artery Bone
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First trimester 1 week – marble size 6 weeks – hen egg size 2 months – baseball size 3 months – softball size
Second trimester 4 months – volleyball size 5 months – basketball size 6 months – fetus out of reach
Third trimester 7-9 months – bony calf, increasing in size