Effects of time after a second dose of immunization against GnRF (Improvest) independent of age at slaughter on commercial bacon slicing characteristics of immunologically castrated barrows

Tavárez, M. A.; Bohrer, Benjamin M.; Herrick, R; Mellencamp, Martha A.; Matulis, R. J.; Ellis, Michael; Boler, D. D.; Dilger, A. C.

doi:10.1016/j.meatsci.2015.09.005

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…The majority of studies comparing IC and PC barrows were ended at a constant age for comparison of different lengths of time after second dose of Improvest ( Boler et al, 2012 ; Tavárez et al, 2014 ; Tavárez et al, 2016 ). Although ending live weights (ELW) of IC barrows were not statistically different ( P = 0.13) from PC barrows, the ELW of IC barrows was 3.12 kg heavier (129.21 vs. 126.09 kg) than PC barrows.…”

Section: Resultsmentioning

confidence: 99%

“…These studies include Boler et al (2011a , 2012 , and 2014 ), Lowe et al (2014 , 2016a , 2016b) , Tavárez et al (2014) , and Harris (2014) . Within the belly quality characteristic evaluation, 7 studies were used: Boler et al (2011b , 2012) , Kyle et al (2014) , Lowe et al (2014 , 2016b) , Tavárez et al (2014 , 2016) , and Harris (2014) . Loin quality summaries were conducted using 8 studies: Pauly et al (2009) , Boler et al (2011a , 2012 , and 2014 ), Lowe et al (2014 , 2016b) , Tavárez et al (2014 , 2016) , Harris (2014) , and Elsbernd et al (2016) .…”

Section: Methodsmentioning

confidence: 99%

“…Within the belly quality characteristic evaluation, 7 studies were used: Boler et al (2011b , 2012) , Kyle et al (2014) , Lowe et al (2014 , 2016b) , Tavárez et al (2014 , 2016) , and Harris (2014) . Loin quality summaries were conducted using 8 studies: Pauly et al (2009) , Boler et al (2011a , 2012 , and 2014 ), Lowe et al (2014 , 2016b) , Tavárez et al (2014 , 2016) , Harris (2014) , and Elsbernd et al (2016) . Some studies included more than 1 experiment and data meeting criteria for cutability and belly analyses were included in both analyses.…”

Section: Methodsmentioning

confidence: 99%

“…Immunological castration (Improvest, Zoetis Inc., Kalamazoo, MI, GnRF analog-diphtheria toxoid conjugate ) provides an effective alternative to physical castration for reducing boar odor of intact male pigs while improving lean deposition compared with physically castrated ( PC ) barrows. The effects of immunological castration on growth performance ( Dunshea et al, 2013 ), carcass cutability ( Boler et al, 2011a , 2012 ) and belly quality ( Kyle et al, 2014 ; Tavárez et al, 2016 ) have been well documented in a number of studies. However, because experimental objectives differed among research studies, true differences in cutability and other carcass traits between IC and PC carcasses are not clear.…”

Section: Introductionmentioning

confidence: 99%

“…However, because experimental objectives differed among research studies, true differences in cutability and other carcass traits between IC and PC carcasses are not clear. Production factors such as diet ( Tavárez et al, 2014 ), interval between second Improvest injection and slaughter ( Boler et al, 2012 ; Tavárez et al, 2016 ), marketing group ( Lowe et al, 2014 ), and the use of ractopamine hydrochloride ( Lowe et al, 2014 ; 2016b ) all affect cutting yield, belly characteristics, and meat quality attributes of immunologically castrated (IC) barrows. Herrick et al (2016) demonstrated belly quality of IC barrow carcasses is particularly dependent on HCW.…”

Section: Introductionmentioning

confidence: 99%

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A summary review of carcass cutability data comparing primal value of immunologically and physically castrated barrows

Harsh

Cowles

Johnson

et al. 2017

Translational Animal Science

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The objectives were to 1) assess cutability, quality, and value of carcasses from immunologically castrated (IC) barrows compared with carcasses from physically castrated (PC) barrows and 2) evaluate the effect of hot carcass weight (HCW) on cutability and value of IC barrows summarizing U.S. data. Lean cutting yield (LCY) was defined as: LCY = [(whole ham + trimmed loin + Boston butt + picnic + spareribs)/chilled side wt] x 100. Carcass cutting yield (CCY) was determined using the following equation: CCY = [(lean cutting yield components + natural fall belly)/chilled side wt] x 100. To evaluate the effects of HCW of IC barrows on carcass cutting yields, IC barrows were grouped by HCW: light ( < 90.9 kg), average (90.9–97.7 kg), or heavy ( > 97.7 kg). Differences in the value of the carcass components for IC and PC barrow carcasses were calculated using a 5 yr average of meat prices from the USDA Agriculture Marketing Service and the carcass cutting yield estimates generated from this summary. Data were analyzed using the MIXED procedure of SAS with fixed effects of Improvest treatment or HCW group. Study was included as a random effect. This review allowed for a summarization of the treatment averages of 851 IC and PC barrow carcasses. Lean cutting yield of IC barrows was 1.41 units greater (P < 0.0001) than PC barrows (70.97 vs. 69.56%). Similarly, CCY of IC barrows was 1.29 units greater (P < 0.001) compared with PC barrows (87.27 vs. 85.98%). As HCW of IC barrows increased, both CCY and LCY declined (P < 0.01), with light IC barrow carcasses having a 1.43 unit advantage in CCY compared with heavy IC barrow carcasses (P < 0.01). Natural fall bellies of PC barrows comprised a greater (P < 0.05) percentage of side weight than those from IC barrows (15.81 vs. 15.50%). A reduction in belly primal value was confirmed by a 3.43 unit reduction in the commercial bacon slicing yields of IC barrows. However, belly yield and slicing yield differences were minimized when IC barrows were marketed at a heavier weight. Using carcass cutout estimates determined in the summary as the foundation for value calculations, lean cuts of IC barrow carcasses were worth $2.66 to $3.80 more than PC barrow carcasses. Therefore, after adjustment for the reduction in belly primal value, the primal value of an IC barrow carcass was $2.08 to $3.13 greater than a PC barrow carcass.

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Section: Resultsmentioning

confidence: 99%