Performance and plasma urea nitrogen of immunocastrated males pigs of medium genetic potential

Caldara, Fabiana Ribeiro; Santos, Rita Ks; Santos, Luan Sousa dos; Foppa, Luciana; Nääs, Irenilza de Alencar; Garcia, Rodrigo Garófallo; Machado, Simone Pereira

doi:10.21897/rmvz.60

Cited by 2 publications

(2 citation statements)

References 13 publications

(34 reference statements)

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“…Згідно з результатами, представленими Caldara et al (2015), переваги імунокастрації доведено тільки у тварин із низьким та середнім генетичним потенціалом на тлі збільшення коефіцієнта конверсії корму, але за відсутності достовірної різниці приростів маси тіла.…”

Section: обговоренняunclassified

The effectiveness of Imrovac® in industrial pork production

Samoilіuk¹,

Bilyi²,

Koziy³

et al. 2021

Theor. Appl. Vet. Med.

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The clinical efficacy of the use of immunobiological castration was studied in comparison with boars in which orchidectomy was performed by open method «on a ligature», as well as in non-castrated animals. It was found that the disadvantage of surgical castration is the risk of bleeding, the development of purulent inflammatory process (edges of the surgical wound, scrotal tissues, stump, common vaginal membrane), as well as intra- and postoperative hernias, which are accompanied by prolapse of the omentum, intestines, and bladder. The low incidence of these complications is offset by the high death rate caused by them. A relatively high level of cryptorchidism was established on the farm, among which bilateral was 27.6%. As a result of the use of immunological castration, in comparison with surgical castration, and with non-castrated boars, the average daily gains were increased, the fattening period was reduced and feed costs were reduced against the background of feed conversion increase by 14 – 27%. The use of Improvac® (Pfizer Ltd) led to better assimilation of feed, an increase in the amount of meat on the carcass, in particular, lean meat by 12 – 16%, lumbar depth, the protein content in meat and a decrease of the fat percentage and fat thickness, eliminating specific odor, and reduction in the fattening period, as well as costs for feeding. In particular, compared to non-castrated boars, the weight of chilled half carcasses increased by 1.2 times (P < 0.05). Immunological castration led to atrophy of the testicles: their weight, length and width were smaller compared to non-castrated boars, which again confirms a decrease in the level of boars’ sex hormones. It is important to use Improvac® in breeding boars that have exhausted their potential, eliminating the need to keep them for about three months to reduce their meat and lard smell. Reducing the period of disappearance of the odor of products obtained from boars led to a reduction in the cost of feeding, maintenance, and veterinary care. Production indicators justify the economic feasibility of using immunological castration with Improvac® in order to obtain additional income, given the absence of probable complications associated with the conventional surgical procedure.

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“…Therefore, the benefits may be related to the fact that immunocastrated pigs behave physiologically like intact boars until the second vaccine dose (Caldara et al, 2015). The natural anabolic potential of intact males positively affects the productive results in immunocastrated males, prior to the administration of the second vaccination, whereby these effects are lost.…”

Section: Animal Performancementioning

confidence: 99%

Ractopamine supplementation improves leanness and carcass yield, minimally affecting pork quality in immunocastrated pigs

Costa

Feddern

Athayde

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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This study was carried out to determine the combining effects of feeding up to 15 mg kg -1 ractopamine (RAC) to physically castrated (PC) pigs or those injected with an anti-GnRF vaccine (IC), on growth performance during suckling, weaning, growing and finishing phases. Out of a total of 1,160 male piglets, 50 % were surgically castrated at age 7, while 50 % underwent immunization against GnRF on the 103 rd and 136 th day of life. A completely randomized design, with two treatments (PC and IC), was used from the 1 st until the 60 th day of life. Afterwards, 792animals, PC and IC, selected according to overall average weight (23.3 ± 0.69 kg) were allotted based on a completely randomized block design with a 2 × 4 factorial arrangement of treatments (castration categories × RAC levels) with 9 replications (11 animals) per main combination effect. IC growing pigs improved feed conversion due to lower average daily feed intake and higher average daily gain (ADG). During the finishing phase, both RAC and immunocastration increased body weight, but the effects were independent. RAC, on its own improved ADG and feed conversion. However, pigs fed 10 mg kg -1 RAC had higher blood lactate compared to those fed lower levels, suggesting that these animals were more susceptible to stress. Muscle depth was influenced only by RAC, whereas fat thickness was lower for IC. Lean meat increased and fat decreased in the shoulder and belly of IC; RAC had a positive effect on belly lean meat only.Either immunocastration or RAC inclusion (at least 5 mg kg -1 ) promoted muscle gain and fat reduction in pig carcass, adding value to pork.

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Performance and plasma urea nitrogen of immunocastrated males pigs of medium genetic potential

Cited by 2 publications

References 13 publications

The effectiveness of Imrovac® in industrial pork production

Ractopamine supplementation improves leanness and carcass yield, minimally affecting pork quality in immunocastrated pigs

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