ABSTRACT
The effect of initial implant type (short or long duration) and reimplant scheme on
performance and carcass characteristics of calf-fed Holstein steers was evaluated.
A total of 240 steers (113.5 ± 6.2 kg) were used in a 349-d trial. The 2 implant strategies were (1) implant on arrival
with 43.9 mg of estradiol and reimplant on d 224 with 120 mg of trenbolone acetate
and 24 mg of estradiol (Imp-2) and (2) implant on arrival with 100 mg of progesterone
and 10 mg of estradiol benzoate and reimplant on d 112 and 224 with 120 mg of trenbolone
acetate and 24 mg of estradiol (Imp-3). During the initial 112 d, performance was
not affected by implant strategy. From d 112 to 212, Imp-3 had greater ADG (9.6%,
P < 0.01), DMI (2.3%, P = 0.04), and gain efficiency (7.0%, P < 0.01) than Imp-2. During the final 137-d period, Imp-3 had similar ADG (P = 0.93) but greater DMI (4.1%, P < 0.01) and lower gain efficiency (3.9%, P < 0.01) than Imp-2. Overall, DMI (2.3%, P = 0.02) and final weight (1.9%, P = 0.07) were greater for Imp-3 versus Imp-2. Treatment effects on gain efficiency
and energy utilization were not appreciable (P > 0.75). Implant strategy had minor effects on carcass characteristics (P > 0.10). Although, LM area was greater (4%, P < 0.01) for Imp-3 versus Imp-2. Implanting with a longer-duration implant on arrival
followed by a combination implant on d 224 (Imp-2) may result in slightly lower ADG
than implanting at 3 intervals (Imp-3).
Key words
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe toAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
LITERATURE CITED
- Effects of synthetic hormone, singularly or in combinations, on performance, carcass traits, and longissimus muscle palatability of Holstein steers.1752819J. Anim. Sci. 1991; 69: 4437-4448
- Interaction of shade and feeding management on feedlot performance of crossbred steers during seasonal periods of high ambient temperature.Prof. Anim. Sci. 2013; 29: 645-651
- Trenbolone acetate/estradiol combinations in feedlot steers: Dose-response and implant carrier effects.1526900J. Anim. Sci. 1992; 70: 1326-1332
- Effects of delayed implant protocols on performance, carcass characteristics and meat tenderness in Holstein steers.J. Anim. Sci. 2002; 80 (Abstr.): 49
- Dairy beef implants strategies: The benefits of TBA containing implants for Holstein steers.in: Pages 237–246 in Proc. Manag. Market. Qual. Holstein Steers, Rochester, MN. Univ. Minnesota, Minneapolis.2005
- Performance and carcass characteristics of Holstein steers in the feedlot with or without Finaplix vs. Synovex implants during the last 100 days.in: Pages 63–64 in Report of Progress. Univ. Minnesota, Waseca, MN1990
- Experimental Designs.2nd ed. John Wiley Sons, New York, NY1992
- Feeding Holstein steers from start to finish.17606151Vet. Clin. North Am. Food Anim. Pract. 2007; 23: 281-297
- Implanting trenbolone acetate and estradiol in finishing beef steers.Nutr. Rep. Int. 1989; 39: 995-1007
- Anabolic implant effects on steer performance, carcass traits, sub-primal yields and longissimus muscle properties.9159272J. Anim. Sci. 1997; 75: 1256-1265
- Dynamic response of cattle to thermal heat loads.15526777J. Anim. Sci. 1999; 77: 10-20
- Effects of energy intake, implantation and subcutaneous fat end point on feedlot steer performance and carcass composition.10784171J. Anim. Sci. 2000; 78: 825-831
- Environmental factors influencing heat stress in feedlot cattle.16478964J. Anim. Sci. 2006; 84: 712-719
- Shade effects on performance, carcass traits, physiology, and behavior of heat-stressed feedlot heifers.12211371J. Anim. Sci. 2002; 80: 2043-2050
- Optimizing carcass value and the use of anabolic implants in beef cattle.J. Anim. Sci. 2001; 79: E296
- Changes in carcass weight and characteristics with increasing weight of large and small cattle.J. Anim. Sci. 1983; 57: 1154-1165
- Nutrient Requirements of Beef Cattle.6th rev. Natl. Acad. Press, Washington, DC1984
- Nutrient Requirements of Beef Cattle.7th rev. Natl. Acad. Press, Washington, DC2000 (Updated)
- Effect of an implant of trenbolone acetate and estradiol on growth, feed efficiency and carcass composition of Holstein and beef steers.1808166J. Anim. Sci. 1991; 69: 4696-4702
- Growth-promotant implants: Managing the tools.17606153Vet. Clin. North Am. Food Anim. Pract. 2007; 23: 309-319
- Implant strategies during feeding: Impact on carcass grades and consumer acceptability.10907829J. Anim. Sci. 2000; 78: 1867-1874
- Implant program effects on performance and carcass quality of steer calves finished for 212 days.8818790J. Anim. Sci. 1996; 74: 1470-1476
- Growth, feed efficiency and variation of individually fed Angus, Polled Hereford and Holstein steers.3610863J. Anim. Sci. 1987; 65: 1-8
- Delay implant strategy in calf-fed Holstein steers: Growth performance and carcass characteristics.10.1080/09712119.2016.1210012J. Appl. Anim. Res. 2016;
- Official United States Standards for Grades of Carcass Beef.USDA, AMS, Washington, DC1997
- Implant sequence effects in intact males Holstein veal calves: Carcass characteristics.10641855J. Anim. Sci. 1999; 77: 3133-3139
- Comparative feeding value of supplemental fat in finishing diets for feedlot steers supplemented with and without monensin.3366709J. Anim. Sci. 1988; 66: 213-227
- Implant strategies for calf-fed Holstein steers.Proc. West. Sec. Am. Soc. Anim. Sci. 1999; 50: 306-309
- Fat and protein supplementation of calf-fed Holstein steers.in: Paper #89 in Proc. Manag. Market. Qual. Holstein Steers, Rochester, MN. Univ. Minnesota, Minneapolis2005
- An evaluation of ruminally degradable intake protein and metabolizable amino acid requirements of feedlot calves.9621934J. Anim. Sci. 1998; 76: 1280-1289
Article info
Publication history
Accepted:
February 15,
2017
Received:
November 28,
2016
Identification
Copyright
Copyright © 2017, American Registry of Professional Animal Scientists. All rights reserved.
