Produção de novilhos castrados ou não castrados terminados em confinamento em idade jovem ou superjovem

Cullmann, Jacson Rodrigo; Kuss, Fernando; Moletta, José Luiz; Lançanova, José Antônio Cogo; Silveira, Magali Floriano da; Menezes, Luis Fernando Glaszenapp de; Moura, Ivan César Furmann; Strack, Maryon Guilherme

doi:10.1590/1678-4162-9100

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…This indicates that the dietary nutrients were best utilized at the 16.32% inclusion level, which had a positive effect on final body weight and mean daily gain. At the 16.32% palm kernel cake inclusion level in the diet, the maximum feed conversion rate was observed (approximately 6.6 kg feed kg -1 gain); these results were similar to those observed for finishing young animals (Cruz et al, 2014;Callegaro et al, 2015;Cullmann et al, 2017;D'Áurea et al, 2017…”

Section: Resultssupporting

confidence: 84%

Increasing levels of palm kernel cake ( Elaeis guineensis Jacq.) in diets for feedlot cull cows

Santos

Silva

et al. 2019

Chil. j. agric. res.

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Agro-industrial by-products are a great option for ruminant feeding. Alternative feedstuffs in ruminant diets are important to increase diets and reduce production costs. The present study evaluated different levels of palm (Elaeis guineensis Jacq.) kernel cake inclusion in diets for feedlot-finished cull cows and their implications on the intake and digestibility of dry matter (DM) and nutrients, as well as animal performance. The experiment was carried out in Ribeirão do Largo, Bahía, Brazil. Thirty-six Holstein × Zebu crossbred cows were assigned to four treatments at the rate of nine cows per treatment. The animals were fed sugarcane bagasse (roughage 15%) and concentrate (85%). The treatments were no addition of palm kernel cake, 8%, 16%, or 24% palm kernel cake inclusion in the total DM diet. Palm kernel cake inclusion influenced DM and nutrient intakes, which responded quadratically. The digestibility of DM, crude protein, and neutral detergent fiber corrected for ash and protein showed a quadratic response and maximum digestibility at 1.67%, 5.24%, and 3.68% cake inclusion levels, respectively; values decreased thereafter. The total digestible nutrients decreased linearly based on cake inclusion levels. Treatments affected final body weight, mean daily gain, and feed conversion, which showed a quadratic response to increasing levels of the by-product in the diet and maximum values were at 11.98%, 13.07%, and 16.32% inclusion, respectively. Palm kernel cake is a viable alternative ingredient for animal biological efficiency. The 16% inclusion level in the total DM diet was the most appropriate for the finishing of cull cows in the feedlot.

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Section: Resultssupporting

confidence: 84%

Increasing levels of palm kernel cake ( Elaeis guineensis Jacq.) in diets for feedlot cull cows

Santos

Silva

et al. 2019

Chil. j. agric. res.

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“…This fat cover can be evaluated as carcass finish, which results in the joint analysis of the fat thickness characteristics in the croup and rib (SANTOS et al, 2018). The results of this study can be explained by the hormonal action of higher testosterone levels (CULLMANN et al, 2017) and somatotropin (KOPCHICK et al, 2019) in uncastrated animals, which reduces early fat deposition, including subcutaneous fat.…”

Section: Resultsmentioning

confidence: 67%

“…The difference in fat deposition between the animals of the sexual conditions evaluated can be explained by the greater action of testosterone, which influences greater protein production per unit of digestible energy (CULLMANN et al, 2017) and somatotropin, which strongly acts in inhibiting lipid synthesis, facilitates lipolysis and increases the mobilization of fatty acids from fat (KOPCHICK et al, 2019). It is also believed that nutritional factors such as low total energy in the diet may have limited fat deposition.…”

Section: Resultsmentioning

confidence: 99%

Performance and carcass characteristics of cattle with different castration practices

Anjos,

Miler,

Barboza

et al. 2023

Bol. Ind. Anim.

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The aim of this research was to evaluate the performance and carcass characteristics of immunocastrated cattle, in comparison to castrated and non-castrated cattle supplemented on pasture. 36 bovines were used, distributed in a completely randomized design, in 3 treatments: non-castrated animals (ANC), animals castrated late by the surgical method (ACC) and immunocastrated animals (AIC), with 12 replicates each. Immunocastration was performed following the protocol of two doses of the immunocastrating vaccine, with an interval of 60 days, promoting a castrated effect of 120 days. The animals were kept on mixed pasture in an extensive rearing system using rotational grazing, they received mineral supplement in the first 3 months and specific feed for the fattening season in the subsequent 3 months, according to the property’s standards. The total experimental period was 180 days. Data were hidden from the normality test, analysis of variance and mean comparisons were performed using the Tukey test, except for the variable degree of finishing, which was maintained at the chi-square test, at 5%. Average daily weight and total weight gains, hot and cold carcass weights and hot and cold carcass yield did not show statistical differences (P>0.05) for animals submitted to different treatments. However, the cooling loss was lower in immunocastrated animals (P<0.05), followed by surgically castrated and non-castrated animals. Immunocastrated and surgically castrated animals showed better carcass finishing (P<0.05) than non-castrated animals. The initial temperature of the carcass was lower (P<0.05) in the immunocastrated group, while for the final temperature no statistical differences (P>0.05) were verified for the animals submitted to different treatments. Final carcass pH was higher (P<0.05) in immunocastrated than in surgically castrated animals, but did not differ (P>0.05) from non-castrated animals. Immunocastrated animals, in a grazing system receiving supplementation, showed similar gains in weight and carcass weight in relation to non-castrated and surgically castrated animals, however, with lower losses to carcass cooling.

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“…The chemical analysis of the diet is shown in Table 1. More details on the animals' husbandry and performance can be observed in Cullmann et al (2017).…”

Section: Methodsmentioning

confidence: 99%

Effect of age and sexual condition on the fatty acid profile of intramuscular fat of cattle finished in feedlot

Carrilho

Kuss

Moletta

et al. 2023

Food Sci. Technol (Campinas)

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The objective of this study was to evaluate the fatty acid (FA) profile of intramuscular fat of cattle of two categories (16 or 26 months old) and two sexual conditions (Bulls or Steers) finished in feedlot. A total of 32 castrated (n=16) or noncastrated (n=16) animals of the genetic groups ½Purunã + ½Canchim were used. The animals were finished in feedlot, receiving a diet with 50% roughage and 50% concentrated feed. After the slaughter, one Longissimus dorsi sample from each animal was sent to the laboratory for FA profile analyses. The FA content of C17:0 iso and C18:0 was higher for animals slaughtered at 26 months. Lignoceric acid (C24:0) showed a higher content for animals aged 16 months. Animals slaughtered at 16 months showed higher C18:1 cis 11, C18:1 cis 12, C18:1 cis 15, and lower C18:1 trans 16 than those slaughtered at 26 months. The C20:4 and C22:5 were lower as the animals' slaughter age increased. The unsaturated/saturated and polyunsaturated/saturated ratios showed no difference for slaughter age. The concentrations of C24:0, C18:1 trans 10, C18:1 cis 11, C18:1 cis 12, and C22:1 were greater in the meat of bulls than in steers. Bulls had a higher content of polyunsaturated FAs and polyunsaturated/saturated ratio than steers.

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Produção de novilhos castrados ou não castrados terminados em confinamento em idade jovem ou superjovem

Cited by 3 publications

References 17 publications

Increasing levels of palm kernel cake ( Elaeis guineensis Jacq.) in diets for feedlot cull cows

Increasing levels of palm kernel cake ( Elaeis guineensis Jacq.) in diets for feedlot cull cows

Performance and carcass characteristics of cattle with different castration practices

Effect of age and sexual condition on the fatty acid profile of intramuscular fat of cattle finished in feedlot

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