Theory question 103
Reproduction in Farm Animalsa. State two functions of each of the following reproductive hormones in livestock. (i) progesterone; (ii) androgen; (iii) oestrogen; (iv) luteinizing hormone b. Complete the table below.
Common name | Botanical name | Type of forage
Elephant grass | (i): | Grass
Tropical kudzu | (ii): | Legume
Gliricidia | (iii): | (iv):
(v): | Andropogon gayanus | (vi)
(vii): | Centrosema molle | Legume
Leucaena | Leucaena leucocephala | (viii):
Bahama grass | (ix) | Grass
(x) | Panicum maximum | Grass
c. Mention two methods of mating in animal production.
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a(i) Progesterone: maintains pregnancy; prepares the uterus for implantation; develops the mammary glands; prevents heat during pregnancy
(ii) Androgen (testosterone): development of male sex organs and sperm production; male characteristics and libido; muscle growth
(iii) Oestrogen: causes heat signs; development of female characteristics and reproductive tract; growth of mammary ducts
(iv) Luteinizing hormone: causes ovulation; forms the corpus luteum; stimulates testosterone production in males
b. (i) Pennisetum purpureum; (ii) Pueraria phaseoloides; (iii) Gliricidia sepium; (iv) legume (browse); (v) gamba grass; (vi) grass; (vii) centro; (viii) legume (browse); (ix) Cynodon dactylon; (x) Guinea grass
c. Any two: hand mating; pen mating; flock/pasture mating; artificial insemination
Two functions for each hormone; botanical names in italics.