Effect of terminal sire line and timing second vaccination on effectiveness of immunocastration, performance, and carcass and meat quality

Kowalski, Eline; Vossen, Els; Millet, Sam; Ampe, Bart; Smet, Stefaan De; Aluwé, Marijke

doi:10.1016/j.meatsci.2021.108451

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…The second dose (D2) of IMP creates an effective immune response and should be administered at least 4 wk after the first dose. While the timing of D2 to harvest has been delineated for males ( McCauley et al, 2003 ; Oliver et al, 2003 ; Kowalski et al, 2021 ), there is limited information on the optimal timing of D2 to harvest for growth in the gilt. However, it has been shown that after D2, gilts experience increased ADG, increased ADFI, variability in feed efficiency (i.e., no change, increased, or decreased feed efficiency), increased live weight, and increased backfat ( Oliver et al, 2003 ; Bohrer et al, 2014 ; Daza et al, 2014 ; Van den Broeke et al, 2016 ; Rodrigues et al, 2019 ; Poulsen Nautrup et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

The effect of timing of Improvest administration on growth performance and carcass characteristics in gilts

Vásquez-Hidalgo

Mellencamp

Amodie

et al. 2023

Translational Animal Science

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Improvest (IMP; Zoetis Inc., Parsippany, NJ) has been approved by the U.S. Food and Drug Administration for use in gilts. Improvest is administered twice: the first dose should be administered no earlier than 9 weeks of age and the second dose (D2) at least 4 weeks after the first dose. The aim of this study was to determine how the timing of IMP before harvest affects growth performance and carcass characteristics in gilts. A total of 1,632 gilts were allocated to 4 groups (12 pens/treatment; 34 gilts/pen): 1) a control group did not receive IMP; 2) T-early gilts received IMP at on day 7 (Day 0 = 10 weeks post-weaning), and D2 on day 40 (i.e., 35 days prior to first removal for harvest); 3) T-medium gilts received IMP on day 21 and D2 on day 56 (i.e., 19 days prior to first removal for harvest); 4) T-late gilts received IMP on day 35 and D2 on day 70 (i.e., 5 days before first removal for harvest). Pigs were selected for harvest by visual observation on days 75, 89, 103 and 117: 1) the heaviest 7 gilts/pen for each treatment on day 75; 2) the heaviest 10 gilts/pen of each treatment at day 89; 3) the heaviest 10 gilts/pen of each treatment on day 103; 4) and the remaining 7 gilts/pen on day 117. Weights and feed disappearance were recorded every 2 weeks and during harvest dates to calculate ADG, ADFI, and feed efficiency (Gain:Feed; G:F). Generalized linear mixed models of SAS were used to analyze all variables. The increase in ADFI over Control gilts was observed 15 days post D2 and continued through 77 days post D2, with advantages in ADG occurring between 15- and 35-days post D2. Control and IMP treated gilts had similar G:F 15 to 33 days post D2. The overall ADG and ADFI from day 0 to market, final live weights, and hot carcass weights were significantly greater (P ≤ 0.05) in IMP gilts compared to Control. When G:F based on live weight was averaged across all groups (i.e., from day 0 to market), T-early had the lowest (P ≤ 0.05) G:F compared to Control, T-medium, and T-late gilts, which did not differ. Carcasses from IMP gilts had increased (P < 0.01) backfat, but similar (P = 0.5) Longissimus muscle depth, compared to Control. Within a cohort of similar aged gilts finishing during the summer, this study indicates that the trajectory of growth is enhanced within a similar window post D2 of IMP. Gilts treated with IMP had heavier carcasses with increased backfat and similar Longissimus muscle depth.

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Section: Introductionmentioning

confidence: 99%

The effect of timing of Improvest administration on growth performance and carcass characteristics in gilts

Vásquez-Hidalgo

Mellencamp

Amodie

et al. 2023

Translational Animal Science

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GnRH-immunocastration: an alternative method for male animal surgical castration

Wang,

Yang,

Zeng

et al. 2023

Front. Vet. Sci.

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Castration of male animals is intended to produce high-enhance quality of animal meat, prevent unpleasant taste, reduce aggressive behavior, and manage overbreeding. Over the years, Tranditional methods of mechanical and surgical castration have been employed over the years, but they fall short of meeting animal welfare requirements due to the associated risk of infection, pain, and stress. Immunocastration, specifically Gonadotropin-releasing hormone (GnRH)-immunocastration, targeting the hypothalamic–pituitary-testis (HPT) axis, has emerged as an animal-friendly alternative to surgical castration, effectively addressing these issues. This review seeks to systematically summarize the principles, development, current applications and challenges of GnRH-immunocastration, offering insights into its role in promoting animal welfare.

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Effect of terminal sire line and timing second vaccination on effectiveness of immunocastration, performance, and carcass and meat quality

Cited by 2 publications

References 54 publications

The effect of timing of Improvest administration on growth performance and carcass characteristics in gilts

The effect of timing of Improvest administration on growth performance and carcass characteristics in gilts

GnRH-immunocastration: an alternative method for male animal surgical castration

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