The effects of recombinant porcine somatotropin on reproductive function in gilts treated during the finishing phase.
The objective of this study was to determine the effects of recombinant porcine somatotropin (rpST) treatment during the finishing phase on subsequent reproductive function in crossbred gilts. Forty gilts weighing 50 kg and housed in a swine finishing facility were randomly assigned to control or rpST treatment. Four control and four rpST-treated gilts were allotted per pen. Twenty rpST-treated gilts received 6 mg of rpST.gilt-1.d-1 in 1 ml of buffered carrier and 20 control gilts received 1 ml of buffered carrier.gilt-1.d-1. Injections were administered daily at 1400 in the extensor muscle of the neck. All gilts received an 18% CP diet containing 1.2% lysine. Treatment was terminated when the average weight in each pen reached 110 kg. Gilts treated with rpST gained more weight (P less than .05) than control gilts (59.8 +/- 1.0 vs 53.5 +/- 1.0 kg). Age at puberty was not different (rpST, 182.2 +/- 3.3; control 181.4 +/- 3.1 d). Prior treatment with rpST did not significantly affect length of estrus (rpST, 1.9 +/- .1; control, 1.8 +/- .1 d) or estrous cycle length (rpST, 20.6 +/- .4; control, 20.4 +/- .4 d). Ovulation rates at second estrus were similar for rpST gilts (15.1 +/- .5) and control gilts (14.4 +/- .5). More embryos (P = .10) were recovered on d 9 to 12 of gestation from rpST-treated gilts than from control gilts (13.1 +/- .9 vs 10.7 +/- .9).(ABSTRACT TRUNCATED AT 250 WORDS)
Terlouw
S L
SL
Dept. of Anim. Sci., University of Missouri-Columbia 65211.
Rieke
A R
AR
Cantley
T C
TC
Miller
L F
LF
Day
B N
BN
D000818:Animals; D001823:Body Composition / Q000187:drug effects; D004971:Estrus / Q000187:drug effects; D005260:Female; D005306:Fertilization / Q000187:drug effects; D013006:Growth Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D010060:Ovulation / Q000187:drug effects; D011897:Random Allocation; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000494:pharmacology; D012098:Reproduction / Q000187:drug effects*; D012741:Sexual Maturation / Q000187:drug effects; D013552:Swine / Q000254:growth & development / Q000502:physiology*; D015430:Weight Gain / Q000187:drug effects
D011994:Recombinant Proteins; D013006:Growth Hormone