Finishing lamb performance responses to bovine and porcine somatotropins administered by Alzet pumps.
Daily injection of ovine and bovine somatotropin (oST and bST, respectively) has been shown to improve performance and carcass quality of finishing lambs. To evaluate responses to continuously released bST and porcine ST (pST), which have 99 and 91% sequence homology with oST, respectively, finishing lambs were implanted with 2-wk Alzet pumps containing bST or pST, which was released at rates of 2 or 4 mg/d. Six-week growth rate and feed efficiency responses to bST were greater than those to pST (P less than .05). Overall feed efficiency was improved 15% and growth rate was increased 16% in lambs treated with 4 mg/d of bST compared with control lambs and neither trait was affected in pST-treated lambs. Performance responses were reflected by changes in circulating glucose, blood urea nitrogen, and insulin-like growth factor I (IGF-I) concentrations. Scatchard analysis of sera with relative binding of greater than 30% revealed that average binding capacities and affinities of pST-treated lambs were 7.0 mg/liter and 6.0 x 10(9) liters/mol, respectively, and of bST-treated lambs were .8 mg/liter and 1.3 x 10(9) liters/mol, respectively. In addition, lambs with high-capacity pST antibodies had lower 6-wk IGF-I concentrations than those of controls, suggesting that these antibodies may have been attenuating responsiveness to pST. It is concluded that continuously released bST, but not pST, improves performance of finishing lambs.
McLaughlin
C L
CL
Anim. Sci. Div., Monsanto Agricultural Company, St. Louis, MO 63198.
Rogan
G J
GJ
Buonomo
F C
FC
Cole
W J
WJ
Hartnell
G F
GF
Hudson
S
S
Kasser
T R
TR
Miller
M A
MA
Baile
C A
CA
D000818:Animals; D001667:Binding, Competitive; D001786:Blood Glucose / Q000032:analysis; D001798:Blood Proteins / Q000032:analysis / Q000378:metabolism; D001806:Blood Urea Nitrogen; D002417:Cattle; D004435:Eating / Q000187:drug effects; D005260:Female; D013006:Growth Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D015918:Infusion Pumps, Implantable / Q000662:veterinary; D007334:Insulin-Like Growth Factor I / Q000032:analysis; D008024:Ligands; D008297:Male; D011485:Protein Binding; D011897:Random Allocation; D012756:Sheep / Q000254:growth & development*; D013552:Swine; D015430:Weight Gain / Q000187:drug effects
D001786:Blood Glucose; D001798:Blood Proteins; D008024:Ligands; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone