Evaluation of long-acting implant programs for calf-fed Holsteins

Quinn, M.J.; Stamm, Courtney; Shreck, Adam L.; Parr, S. L.; Booker, Calvin W.; Hannon, Sherry J.; Corbin, Marilyn J.; Rademacher, Ryan D.; May, M.L.

doi:10.15232/aas.2019-01972

Cited by 3 publications

(9 citation statements)

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“… Kayser et al (2019) reported the greatest percentage of bullers in the medium dose and timing of TBA administration treatment, contrary to the current study where percentage of bullers increased linearly with TBA potency and timing of administration. Similar to the outcome observed in the current study, Quinn et al (2020) reported few to no buller treatments from d 0 to first reimplant, and the greatest increase of buller treatments after 160 days on feed.…”

Section: Resultssupporting

confidence: 87%

“…From d 80 to d 160, IS/IS/XS had the greatest ( P < 0.01) percentage of first pull bullers, while Ral/IS/XS had the most ( P = 0.03) first pulls from d 160 to the conclusion of the study. Percentage of bullers is similar to those reported by Kayser et al (2019) and lower than those observed by Quinn et al (2020) . Kayser et al (2019) reported the greatest percentage of bullers in the medium dose and timing of TBA administration treatment, contrary to the current study where percentage of bullers increased linearly with TBA potency and timing of administration.…”

Section: Resultssupporting

confidence: 87%

“…No differences ( P ≥ 0.28) were observed for mortality related to implant treatment. Mortality rates in the present study were greater than the expected 4% to 7% observed by Kayser et al (2019) and Quinn et al (2020) for Holstein steers fed for similar days on feed. In the present study, 70% of deaths occurred prior to 120 days on feed and 48% of removals occurred between 200 and 300 days on feed.…”

Section: Resultscontrasting

confidence: 74%

“…Such that steers administered a Revalor-IS at d 0 or d 80 (Ral/IS/XS and IS/IS/XS) increased BW 1.5% compared to steers administered Enc/XS that did not receive a combination TBA and estrogen implant until d 160 (410 and 412 vs. 405 kg). Research has consistently demonstrated that both beef- and dairy-type steers increase body weight following implant administration ( Scheffler et al, 2003 ; Parr et al, 2011 ; Quinn et al, 2020 ), and differences in body weight between implanted and non-implanted steers can be observed as early as d 70 post-implantation ( Smith et al, 2018 ). Final BW was not different ( P = 0.12) as a result of implant treatment.…”

Section: Resultsmentioning

confidence: 99%

“…The combination trenbolone acetate ( TBA ) and estradiol implants increased the expression of genes associated with muscle tissue growth ( Parr et al, 2014 ; Smith et al, 2017 , 2019 ). Based on previous literature, there appears to be an effect of TBA administration potency and timing on the live and carcass performance of fed, pure-bred Holstein cattle which is not fully understood ( Scheffler et al, 2003 ; Torrentera et al, 2017 ; Kayser et al, 2019 ; Quinn et al, 2020 ) and could be extrapolated to beef × dairy steers. Therefore, the objective of this study was to evaluate the effects of timing and total potency of TBA administration on bulling outcomes, live performance, and carcass characteristics of beef × dairy steers.…”

Section: Introductionmentioning

confidence: 99%

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The effect of different implant programs on beef × dairy steer feedlot growth performance and carcass characteristics

Wesley,

Word,

Maxwell

et al. 2023

Translational Animal Science

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The objective of this study was to evaluate potency and timing of trenbolone acetate (TBA) administration on live performance and carcass characteristics of beef × dairy steers. A total of 6,895 beef × dairy steers [initial body weight (BW) = 157 ± 5.2 kg] were allotted into 30 pens, with pen as the experimental unit. Each pen was randomly assigned 1 of 3 implant treatments: 1) Revalor-IS (IS) at d0, IS at d80, and Revalor-XS (XS) at d160 (IS/IS/XS); 2) Ralgro at d0, IS at d80 and XS at d160 (Ral/IS/XS); or 3) Encore at d0 and XS at d160 (Enc/XS). Steers were blocked by arrival date, each pen was terminally sorted 3 ways at 257 ± 22 days on feed and harvested at 329 ± 25 days on feed. For live and carcass outcomes, fixed effect of implant treatment and random effect of block were evaluated. Data are reported on a deads and removals out basis. Removals, morbidity, and mortality were similar (P ≥ 0.45). Steers administered TBA prior to d 160 were 5.8 kg heavier (P = 0.03) than Enc/XS steers at d 160. Final BW was not different (P = 0.78). Early administration of a TBA-containing implant resulted in an increased prevalence of bullers [2.40, 5.18, 6.86% (for Enc/XS, Ral/IS/XS, and IS/IS/XS) respectively; P < 0.01]. Dry matter intake (DMI) was 2.3% greater (P < 0.01) in steers administered Enc/XS compared to IS/IS/XS; however, DMI as a percentage of BW, average daily gain, and feed efficiency were not different (P ≥ 0.12). Dressing percentage, hot carcass weight, heavy carcass occurrence, Longissimus muscle area, and 12th rib fat thickness were similar among all steers (P ≥ 0.28). Marbling score tended to be greatest for Enc/XS and Ral/IS/XS (P = 0.09). Enc/XS graded a greater proportion of USDA Prime and fewer USDA Select carcasses than IS/IS/XS (P < 0.05). Enc/XS and Ral/IS/XS tended (P = 0.09) to have more USDA Yield Grade (YG) 1 carcasses. While delayed administration or decreased total potency of TBA-containing implants may decrease buller incidence and improve Quality Grade, few differences were observed in live or carcass outcomes.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 87%

Section: Resultscontrasting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of different implant programs on beef × dairy steer feedlot growth performance and carcass characteristics

Wesley,

Word,

Maxwell

et al. 2023

Translational Animal Science

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Post-weaning management of modern dairy cattle genetics for beef production: a review

Jaborek

Carvalho

Felix

2023

Journal of Animal Science

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The contribution of dairy steers to the U.S. fed beef supply has increased from 6.9% to 16.3% over the last two decades; in part, due to declining beef cow numbers and the increased use of sexed dairy semen to produce genetically superior replacement heifers from the best dairy cows. Raising dairy cattle for beef production offers unique opportunities and challenges when compared with feeding cattle from beef breeds. Dairy steers offer predictable and uniform finishing cattle performance (ADG, DMI, G:F) as a group and more desirable quality grades on average compared with their beef steer counterparts. However, dairy steers have lesser dressing percentages and yield 2%–12% less red meat compared with beef steers due to a greater ratio of bone to muscle, internal fat, organ size, and gastrointestinal tract weight. In addition, carcasses from dairy steers can present problems in the beef packing industry, with Holstein carcasses being longer and Jersey carcasses being lighter weight than carcasses from beef breeds. Beef × dairy crossbreeding strategies are being implemented on some dairy farms to increase the income generated from dairy bull calves, while beef × dairy crossbreeding strategies can also improve the G:F and red meat yield of beef produced from the U.S. dairy herd. This alternative model of beef production from the dairy herd is not without its challenges and has resulted in variable results thus far. Successful adoption of beef × dairy crossbreeding in the cattle industry will depend on the proper selection of beef sires that excel in calving ease, growth, muscling, and marbling traits to complement the dairy genetics involved in beef production.

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Effects of days on feed on performance and carcass characteristics of crossbred beef × dairy heifers

Husz,

Word,

Karr

et al. 2024

Applied Animal Science

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Evaluation of long-acting implant programs for calf-fed Holsteins

Cited by 3 publications

References 0 publications

The effect of different implant programs on beef × dairy steer feedlot growth performance and carcass characteristics

The effect of different implant programs on beef × dairy steer feedlot growth performance and carcass characteristics

Post-weaning management of modern dairy cattle genetics for beef production: a review

Effects of days on feed on performance and carcass characteristics of crossbred beef × dairy heifers

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