J. Anim Sci.
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Journal of Animal Science, Vol 73, Issue 2 589-597, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Effect of dietary protein and estradiol-17 beta on growth and insulin-like growth factor I in cattle during realimentation

C. L. Hays, G. M. Davenport, T. G. Osborn and D. R. Mulvaney
Department of Animal and Dairy Sciences, Alabama Agricultural Experiment Station, Auburn University 36849-5415, USA.

Forty-eight medium-framed, crossbred steers (average BW = 268 +/- 20 kg) were limit-fed a 35% concentrate diet to gain approximately .10 kg/d during a 66-d restriction (REST) period. This was followed by a 98-d realimentation (REAL) period in which steers were allotted to a 3 x 2 factorial arrangement of treatments. Treatments were 80% concentrate diets containing 9, 12, or 15% CP, and implantation of one-half of the steers with 24 mg/steer of estradiol-17 beta (E2; Compudose). The allotted steers were distributed across four pens (12 steers/pen) with each pen containing two replicates of each treatment combination. Individual feed intakes were monitored using a Calan gate system. Each steer had ad libitum access to its respective diet. Longissimus muscle area and fat thickness at the 12th rib were measured using real-time ultrasound. Dry matter intake was not affected by CP or E2 through d 56. Steers fed 9% CP weighed less (quadratic, P < .05) after d 14 than steers fed 12 or 15% CP due to slower (quadratic, P < .05) gains during this initial period. Implantation increased (P < .05) ADG from d 15 to 56 resulting in heavier BW (P < .05) on d 56 and 98. Increasing concentrations of dietary CP resulted in linear (P < .05) increases in longissimus muscle area on d 28 and 56, and fat thickness on d 98. Serum IGF-I concentrations were lowest on d -21 of REST and highest on d 28 of REAL (quadratic, P < .05).(ABSTRACT TRUNCATED AT 250 WORDS)


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C K Hilleson-Gayne and J A Clapper
Effects of decreased estradiol-17{beta} on the serum and anterior pituitary IGF-I system in pigs
J. Endocrinol., December 1, 2005; 187(3): 369 - 378.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Society of Animal Science.