Influence of porcine somatotropin on endocrine and histological variables in gilts.
作者： C. J. Andres , M. L. Green , J. A. Clapper , T. R. Cline , M. A. Diekman
关键词: Posterior pituitary 、 Animal science 、 Adrenocorticotropic hormone 、 Blood urea nitrogen 、 Blood collection 、 Longissimus muscle 、 Gestation 、 Extensor muscle 、 Endocrine system 、 Medicine
摘要: Thirty-six crossbred gilts (71.7 +/- .9 kg and 140.1 d) were assigned to one of three doses (0, 35, or 70 micrograms.kg BW-1 x d-1) recombinant porcine somatotropin (rpST). The rpST adjusted weekly, i.m. injections continued until d 50. Gilts pen fed (six gilts/pen) a 17% CP corn-soybean diet (1.2% lysine 3.2 Mcal ME/kg). At 50, feed intake, feed:gain ratios (P = .02), blood urea nitrogen decreased .05) conception rate, age, weight at puberty. Numbers blastocysts corpora lutea observed 10.4 1.5 gestation (42.2 after final injection) unaffected > by treatment. Anterior posterior pituitary weights increased rpST. After withdrawal period 42.2 2.0 d, < .02) the estimated percentage lean 5.8% longissimus muscle area 10.4%. Eighteen hours before initial injection (d 0), 10 per dose catheterized. Catheterizations repeated on 40. diluent was given in extensor neck 1 h initiation collection. Adrenocorticotropic hormone (1.4 IU/kg BW) administered through catheter 3 collection.(ABSTRACT TRUNCATED AT 250 WORDS)
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