Influência da imunocastração (Bopriva®) no ganho de peso, características de carcaça e qualidade da carne de bovinos Nelore

The objective of this study was evaluate the effects of immunocastration on body weight gain, carcass characteristics and meat quality of Nellore beef cattle. Eighty Nellore beef cattle, with initial body weight of 357 +/- 8.63 kg, were placed in feedlots and distributed in two treatments (40 animals per treatments) as follow: one - non-vaccinated bulls and two - immunocastrated bulls (Bopriva (R), Pfizer Animal Health). The animals placed on treatment two were vaccinated in two doses, first application 30 days before they arrive on the feedlots and second on the day they arrive on feedlots. After 67 days of experimental period, was calculated the daily gain of live weight in kg/day of the 80 animals and selected 20 animals from each treatment for the slaughter and carcass evaluations, and ten from each group for the meat analyzes. The data were submitted to analysis of variance. Immunocastrated animals showed lower daily weight gain, hot carcass weight, carcass yield, pH, leg thickness, muscle depth, loin muscle area, carcass muscle percentage, shear force and moisture. However, this animals had higher concentration of lactate and cortisol blood, chest depth, fat thickness, finishing degree, a *, b * and c*, liquid loss in thawing process, myofibrillar fragmentation index and ether extract of meat when compared to non-vaccinated bulss. The immunocastration (Bopriva (R)) is an alternative for improving the quality of meat by the higher fat deposition and by the reduction of the shear force of the meat when compared to non-vaccinated bulls.

A influência do estresse sobre a qualidade da carne

The meat quality is evaluated by consumers according to their physical characteristics, such as color, texture, juiciness, tenderness and odor. The stress during the life of the animal and at the moment before the slaughter may be responsible for changes in the transformation of muscle into meat. Such changes may lead to the appearance of DFD (Dark, Firm and Dry) and PSE (Pale, Soft and Exudative) meats, which are poorly accepted in the market – because of their unusual aspect – and inadequate to industrial processing. Factors related to the handling, loading, transport, unloading, resting period and stunning are singled out as critical, since that, in these phases the animals are subjected to adverse situations to which they are accustomed. The aim of this study is to identify the process of ante-mortem and the slaughter itself in which the animals are subjected to stressful situations, as well as the consequences of stress on meat quality

Susceptibilidade ao estresse e qualidade de carne de suínos suplementados com diferentes níveis de Ractopamina

The ractopamine is a β-adrenergic agonist used as a divider of energy in diets for finishing pigs. However, research shows that this additive may effect on welfare and meat quality. In this context, the aim was to evaluate the influence in three levels of inclusion of ractopamine (0, 5 and 10ppm) in commercial pigs diet (castrated, males and females, n = 340) for 28 days pre-slaughter on the welfare and meat quality. The wellbeing was assessed by the behavior of animals, number of skin damages, carcass damages and physiological stress (lactate, cortisol and creatinine phosphokinase). The evaluation of meat quality was performed by analyzing pH, color, drip and cooking loss, shear force and marbling of the longissimus dorsi muscle of 90 selected pigs. There was no influence of treatments on the behavior, the total number of skin damages and carcass damages or concentration of cortisol and lactate. However, levels of the enzyme creatine phosphokinase (CPK) increased in pigs supplemented with ractopamine. This shows that, somehow, this additive led to physiological changes in animals that consumed it. PH and drip loss did not change by the addition of ractopamine in the diet. In contrast, the Longissimus dorsi of pigs that received ractopamine presented less intense red color and no difference was found in L* and b*. The inclusion of ractopamine in the diet reduced the degree of marbling, cooking loss and tenderness of the muscle. Supplementation did not lead to behavioral change, increased incidence of injury, plasma cortisol and lactate and minimal impact on meat quality. However, there was evidence that the animals fed the additive suffered physiological changes

Jejum no pré-abate de suínos: bem estar animal e qualidade da carne

In the pre-slaughter management of pigs there are stressors, which depending on the duration or severity, are able to alter the quality of meat. One of the factors considered critical to the welfare is the fasting period in the farm. This practice is fundamental and proven relevance in the production chain. Besides the effects on meat quality and welfare of pigs, fasting is among the main factors responsible for the incidence of skin lesions, can significantly influence the incidence of esophagogastric ulcers and is also important to avoid any contamination of carcasses by gastrointestinal contents. When fasting is done right, it has a positive impact on welfare, meat quality and conditions of welfare during the pre-slaughter management of pigs

Desempenho, qualidade de carcaça e da carne de cordeiros alimentados com dietas contendo silagens de milho consorciadas ou não com capins tropicais

Pós-graduação em Ciência e Tecnologia Animal - FEIS

Efeitos dos derivados vegetais de condimentos nas características de qualidade e vida de prateleira de linguiça de frango fresca

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Utilização de informações genômicas para o melhoramento genético de características da carne em bovinos da raça Nelore

Pós-graduação em Genética e Melhoramento Animal - FCAV

Bacillus subtilis na qualidade dos pintinhos ao nascer, desempenho e características intestinais dos frangos

Pós-graduação em Zootecnia - FCAV

Crude glycerin in the supplement for beef cattle on pasture

Pós-graduação em Zootecnia - FCAV

Different sources of forage with crude glycerin in diets with higher percentage of concentrate to beef cattle

Pós-graduação em Zootecnia - FCAV

Desempenho de bovinos cruzados e parâmetros qualitativos de músculos maturados

Pós-graduação em Zootecnia - FCAV

Lisina e metionina+cistina digestíveis sobre o desempenho, rendimento, qualidade e morfometria do músculo peitoral (Pectoralis major) de frangos de corte

Pós-graduação em Zootecnia - FCAV

Níveis e tipos de fibra dietética para suínos pesados em restrição alimentar qualitativa

Pós-graduação em Zootecnia - FCAV

Implicações da disponibilidade de espaço no confinamento de bovinos de corte

Pós-graduação em Zootecnia - FCAV

O uso de ducha: efeito sobre o bem-estar e a qualidade da carcaça e da carne em suínos transportados para o abate

This study was carried out to evaluate the effects of a shower before and after pig transportation on welfare, meat and carcass quality. We used 384 crossbreeding animals (females and castrated males), from 16 farms in Santa Catarina State, Brazil. A 2x4 factorial arrangement of treatments was employed with two distances from farm to slaughter plant (less than 50km and more than 50km) and four showering protocols. These protocols were applied on pigs: no showering at farm or slaughter plant (Control), no showering at farm but showering at the plant (NMG_MOF); showering at the farm and no showering at the plant (MOG_NMF); showering at the farm and plant (MOG_MOF). None of the factors influenced (P>0.05) physiological variables related to stress (cortisol and lactate in blood samples), number of carcass lesions and the characteristics of meat quality.