The objectives of this study were to investigate the effects of recombinant bovine somatotropin (bST), Revalor and the combination of the two on beef carcass characteristics, quality and physical, chemical and palatability attributes of bovine longissimus (loin eye) muscle. Crossbred steers (n = 20) were blocked by body weight and allotted in a 2 x 2 factorial arrangement of treatments: control, Revalor-S® (Trenbolone acetate 120 mg+estraiol 24 mg) implanted in ear on day 1 and 97, bST (160 mg/wk), and Revalor-S® + bST and fed for 140 days. Loin eye was removed from left side, cut into 2.4 cm steaks and postmortem aged for 13 days. Revalor treatment increased (p<.05) body, hot carcass, longissimus and semitendinosus weights and loin eye area; however, bST had no effect (p< .05) on these variables. Backfat, KPH fat %, and dressing percentage were not affected (p< .05) by either Revalor or bST. Carcass composition was physically separated into lean, fat, and bone. Lean, fat, and bone were increased (p<.05) by Revalor; however,

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=12509&context=rtd

Plasma levels of growth hormone, insulin and plasma protein-bound iodine in finishing cattle.

Interaction of growth hormone with androgen/estrogen on beef carcass characteristics, and chemical, physical and palatability properties of longissimus muscle of steers

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=9389&context=rtd

Effects of organophosphate pesticides on lipogenesis in adipose tissue and skeletal muscle of steers

The objective of this study was to examine the effect of plasma leptin and insulin concentrations on fat traits in Hanwoo. If a biological indicator such as plasma leptin and insulin was identified, it would be a useful biological marker that can be predicted marbling score in young animal. The relationship between plasma hormone (leptin and insulin) and fat traits (marbling score, back fat thickness and P8 fat thickness) was investigated. The experiment studies 100 Hanwoo that were randomly sampled from Hanwoo Experimental Station Herd. The concentration of plasma insulin was significantly associated with marbling score (P=0.02) but was not significantly with back fat thickness (P=0.07) and P8 fat thickness (P=0.09). Statistical model determinant that plasma insulin concentration account for phenotypes was moderate on marbling score (5%), back fat thickness (3%) and P8 fat thickness (9%). On the other hand, plasma leptin concentration was significantly associated with marbling score (P=0.03) and back fat thickness (P=0.02), but was not significant on P8 fat thickness (0.07). Statistical model determinant that plasma leptin concentration accounting for phenotypes was moderate effect on marbling score (3%) and back fat thickness (2%), but it has a slightly bigger effect on P8 fat thickness (7%). In conclusion, the plasma leptin and insulin seems to have an effect on fat traits (marbling score, backfat thickness and P8 fat thickness) in Hanwoo.

http://www.koreascience.or.kr:80/article/JAKO201225067513988.pdf

Plasma levels of growth hormone, insulin and plasma protein-bound iodine in finishing cattle.

Citations

Interaction of growth hormone with androgen/estrogen on beef carcass characteristics, and chemical, physical and palatability properties of longissimus muscle of steers

Effects of organophosphate pesticides on lipogenesis in adipose tissue and skeletal muscle of steers

Effects of plasma insulin, and leptin on fat traits in Hanwoo (Korean cattle)

Relationships Between Pulsatile Growth Hormone Secretory Parameters and Carcass Traits in Growing Turkeys

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