Growth-Promotant Implants: Managing the Tools

Reinhardt, C. D.

doi:10.1016/j.cvfa.2007.03.004

Cited by 40 publications

(39 citation statements)

References 11 publications

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“…This finding indicates activation of quiescent satellite cells has a role in enhanced muscle growth in mature feedlot steers (Johnson, 1998). This has resulted in significant increases in growth, efficiency, and muscle deposition of steers and heifers (Anderson, 1991;Reinhardt, 2007;Reinhardt, 2014;Mader, 1994).…”

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 96%

“…Conversely, recent literature recognizes the administration of multiple implants requires additional days on feed, when compared to nonimplanted or singly implanted cattle, in order to reach similar body compositional end points (Reinhardt, 2014;Reinhardt, 2007;Selk, 2006). This increase requires an additional 12-15 days on feed and can result in an increase of HCW of 55 pounds, or 8-14% body weight (Reinhardt 2007).…”

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

“…The androgenic hormones used in feedlot implants are trenbolone acetate (TBA) and testosterone. Combination estradiol and TBA implants are also available, and these implants have shown to be additive, as compared to individual hormone use, and have also shown synergism when using the two hormones combined into a single implant (Mader, 1998;Reinhardt, 2014;Reinhardt, 2007;Anderson, 1991).…”

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

“…This increase requires an additional 12-15 days on feed and can result in an increase of HCW of 55 pounds, or 8-14% body weight (Reinhardt 2007). The discrepancies on carcass composition following implant are likely to be multi-factorial and could be influenced by implant type, implant timing, implant potency, and other external factors.…”

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

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Effects of delayed steroid implanting on health, performance, and carcass quality in high health risk, auction market-sourced feedlot steers1,2

Munson

Thomson

Reinhardt

2012

Journal of Animal Science

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Auction derived feeder calves (n=1,601; initial BW = 273.5 + 4.7 kg) were used to examine the effects of delayed administration of the initial steroid implant on health, performance, and carcass characteristics of feedlot cattle. Steers were procured from multiple- were obtained by USDA personnel; presence of lung lesions, pleural adhesions, and liver abscesses was evaluated by trained university personnel. Delaying the initial implant tended to reduce morbidity (24.7 vs. 28.5%; P = 0.13) and reduced railer rates (1.8 vs. 3.3%; P = 0.02); however, there were no effects of timing of implant administration (P ≥ 0.31) on rates of retreatment, mortality, lung lesions, or pleural adhesions. Implanting immediately upon feedlot arrival resulted in numerical improvements in ADG and feed conversion, but these differences were not statistical (P ≥ 0.56). Cattle implanted upon arrival had numerically greater HCW and yield grade vs. cattle implanted on d 45; however, these differences were not statistical (P ≥ 0.16). Delaying the initial implant 45 d did not influence animal health, performance parameters or carcass characteristics in high risk feeder calves.v

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Section: Hormone Implants In Feedlot Cattlementioning

confidence: 96%

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

Section: Hormone Implants In Feedlot Cattlementioning

confidence: 99%

See 2 more Smart Citations

Effects of delayed steroid implanting on health, performance, and carcass quality in high health risk, auction market-sourced feedlot steers1,2

Munson

Thomson

Reinhardt

2012

Journal of Animal Science

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“…Accordingly, the implant reduced the maintenance coefficient by 17%. Alternatively, the improved apparent dietary NE for implanted steers may be a reflection of the nonnutritional action of implants on composition of gain, enhancing net protein retention, and, hence, leaner-than-expected tissue growth for the specified live weight and rate of gain (16). Contrary to the findings of Preston et al (8), the application of bST in implanted intact cattle did not show an additive effect on weight gain, DM intake, or feed efficiency.…”

mentioning

confidence: 62%

Effects of combining recombinant bovine growth hormone and anabolic implants on growth performance and dietary energetics of Holstein bull calves fed finishing diets

González-Vizcarra¹,

López-Soto²,

Pujol-Manriquez³

et al. 2016

Turk J Vet Anim Sci

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Growth-finishing programs for Holstein calves in feedlots have become popular recently in Northwest Mexico. Holstein steers respond with greater gains to high-grain diets than beef steers and are more tolerant to heat stress (1); however, Holsteins require 10% to 12% more energy for maintenance than beef breeds, and they have less muscling than beef breeds (2). In order to increase energy efficiency for growth and muscle development, the use of growth promoters (as steroid implants) is a feasible alternative. Many studies have shown that Holstein cattle have better performance responses when they are implanted at heavier weights (approximately 325 kg live weight) (3). In the same way, the administration of exogenous recombinant somatotropin (recombinant bovine growth hormone, bST) is one biotechnology strategy that increases production (meat or milk) per unit of feed consumed (4,5), but bST promotes protein accretion through different mechanisms than the steroid implants (6,7). A positive response of the effect of combining exogenous bST and implants in feedlot steers has been reported previously (8). Those researchers concluded that the anabolic effects of implants and bST are additive and possibly independent in feedlot steers; however, there is no information available on the comparative effectiveness of both additives in intact cattle. Since, at present, the finishing of intact cattle (bulls) is a widespread system in North Mexico, the objective of this experiment was to determine the effect of combining recombinant bST and anabolic implants on the growth performance and dietary energetics of Holstein bull calves fed a finishing diets. With this aim, 21 Holstein bull calves (initial weight at the start of the experiment: 368 ± 5.2 kg) were individually assigned (7 repetitions/treatment) to pens of 16 m 2 with automatic waterers and 1.2 m fenceline feed bunks. The cattle were processed and adapted to the basal diet and facilities 3 weeks before the start of the experiment. The processing consisted of vaccination against bovine rhinotracheitis and parainfluenza 3 (TSV-27, SmithKline Beecham, West Chester, PA, USA), clostridials (Fortress 7, Pfizer Animal Health, New York, NY, USA), and Pasteurella haemolytica (One Shot, Pfizer Animal Health). The cattle were treated against parasites (Ultramectin, RXV Products, Kansas City, MO, USA) and were injected with 1 × 10 6 IU vitamin A (Vita-Jec A&D "500", RXV Products). Cattle were weighed (electronic Abstract: Twenty-one Holstein bull calves (368 ± 5.2 kg) were used in order to evaluate the effects of combining recombinant bovine growth hormone (bST) and anabolic implants on growth performance and dietary energetics. Steers were assigned (7 repetitions/ treatment) to individual pens (16 m2) equipped with automatic waterers and 1.2 m fence-line feed bunks. The experiment lasted 56 days. Treatments were: 1) no bST, no implant; 2) implant; and 3) bST + implant. Compared to implanted cattle, the combination of exogenous bovine somatotropin and anabolic implants did not e...

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Biosensor-based detection of reduced sex hormone-binding globulin binding capacities in response to growth-promoter administrations

Mooney¹,

Bergwerff

Meeuwen

et al. 2009

Analytica Chimica Acta

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Growth-Promotant Implants: Managing the Tools

Cited by 40 publications

References 11 publications

Effects of delayed steroid implanting on health, performance, and carcass quality in high health risk, auction market-sourced feedlot steers1,2

Effects of delayed steroid implanting on health, performance, and carcass quality in high health risk, auction market-sourced feedlot steers1,2

Effects of combining recombinant bovine growth hormone and anabolic implants on growth performance and dietary energetics of Holstein bull calves fed finishing diets

Biosensor-based detection of reduced sex hormone-binding globulin binding capacities in response to growth-promoter administrations

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