Vanessa Peripolli

Bioeconomic impact of bull breeding soundness examination in cow-calf systems

Avaliou-se o impacto bioeconomico do exame andrologico na producao de bovinos de corte no Sul do Brasil. Foram comparados dois sistemas de producao similares com e sem a adocao do exame andrologico durante quatro anos no municipio de Julio e Castilhos. A taxa de touros inaptos no primeiro exame foi de 22,8%. Com a realizacao do exame, obteve-se aumento de 31% na producao de bezerros, 13,8 bezerros/touro/ano e 24 kg de bezerros/vaca/ano. A relacao beneficio/custo sobre o investimento com o exame andrologico foi de R

Measurement of scrotal circumference in beef bulls in Rio Grande do Sul

35,84. O exame andrologico melhora os aspectos bioeconomicos de sistemas de cria de bovinos de corte.It was evaluated the bioeconomic impact of the breeding soundness evaluation on beef cattle production in southern Brazil. Two similar production systems, with and without the use of breeding soundness evaluation, were compared during 4 years in the municipality of Julio e Castilhos. The rate of unsound bulls in the first examination was 22.8%. By performing the examination, calf production increased by 31%, 13.8 calves/bull/year and 24 kg of calves/cow/year. The benefit/cost ratio on the investment with the breeding soundness evaluation was R

Effect of crude glycerol on in-vitro ruminal fermentation kinetics

35.84. The breeding soundness evaluation improves bioeconomic aspects of beef cow-calf systems.

Perfil lipídico da gordura intramuscular de cortes e marcas comerciais de carne bovina

The variability of scrotal circumference and the effects of age and breed as well as the relationship between testicular weight (TW), scrotal circumference (SC), and live weight (BW) were investigated in bulls. Devon, Polled Hereford, and Red Angus breeds showed higher SC values than the other British, Continental, Synthetic, and Zebu studied breeds. The percentage of culled bulls because of low SC ranged from 7.01 to 24.25%. The increase of SC was proportional to the increase in TW and they were highly correlated (r2= 0.90). The results suggest that SC in young bulls is the best way to predict TW and, therefore, a useful tool for their selection

Causes of rejection of beef bulls in breeding soundness evaluation

O interesse na utilizacao da glicerina bruta na alimentacao animal ressurge, devido ao aumento na disponibilidade e preco favoravel, como consequencia da expansao das industrias de biocombustiveis. O objetivo deste trabalho foi avaliar os efeitos da substituicao do milho por diferentes niveis de glicerina bruta na dieta sobre a fermentacao ruminal atraves da digestibilidade in vitro verdadeira. As dietas experimentais consistiram na substituicao do milho por glicerol (0; 4; 8 e 12%) na materia seca da dieta (MS). As dietas eram compostas por 60% de feno de alfafa e 40% de grao de milho e o glicerol foi adicionado, substituindo o milho nas dietas. Alem de trabalhar com as 48 horas tradicionais, foram utilizados diferentes horarios de digestibilidade in vitro (0; 4; 8; 16; 48; 72 e 96 horas), com a finalidade de estudar a cinetica da digestao. A substituicao do milho por niveis crescente de glicerina bruta na dieta nao afetou a concentracao de N-NH3, o teor de energia metabolizavel, as digestibilidades in vitro da materia orgânica da fibra em detergente neutro, bem como os parâmetros da degradacao ruminal. Portanto, esse subproduto da producao do biodiesel deve ser testado in vivo como uma alternativa energetica na formulacao de dietas para ruminantes.

Nutritional value of baled rice straw for ruminant feed

The objective of this work was to characterize the intramuscular fat of short loin, ramp loin and rib and six commercial brands (A, B, C, D, E and F) of beef commercialized in Porto Alegre, Rio Grande do Sul. Samples were collected from a supermarket chain. The brands A and B were associated with British animals breeds, the brands C and D were from European animals breeds produced in conventional and organic system, respectively, from Uruguay, while the brands E and F were derived from non specific breed and unidentified feeding system, obtained in a slaughterhouse and a regional chain of supermarkets, respectively. The samples were deboned, ground, vacuum packed and stored in cooling temperature until the moment of analysis. In each sample were extracted lipids and fatty acids were identified. The experimental design was a completely randomized, with a 6 × 3 factorial arrangement and analyzed by the GLM procedure of SAS computing application. Regarding lipid profile no significant interaction were found among cuts and brands of commercial cuts. The lipid percentage was 0.95; 3.01 and 0.97% in short loin, ribs and ramp loin cuts. Rib presented the greatest percentage of saturated fatty acids (FA) and the greatest estimate of D9 desaturase from C16:0 and C18:0. The highest percentage of C18:2 cis-9, trans 11, conjugated linoleic acid, CLA, n-6 and n-3 was found in ramp loin. Brand F showed a higher degree of saturation, while the brand D showed higher polyunsaturated fatty acids, polyunsaturated/saturated ratio and trans18 and the lowest saturated fatty acids. There was a significant interaction between cuts and brands for the content of CLA, with the highest content found in the short loin of brand F. The characteristics of intramuscular beef fat depending on the cuts and the commercial brands.

Heat Tolerance in Curraleiro Pe-Duro, Pantaneiro and Nelore Cattle Using Thermographic Images

The objective of this study was to analyze the rates of rejection in the different steps of the breeding soundness evaluation of beef bulls in the state of Rio Grande do Sul, Brazil. The breeding soundness of 22,113 young and mature bulls of 14 beef breeds, participating in the Program of Reproductive Evaluation (PARTO) was evaluated in the experiment. Data concerning to the causes of rejection in the four steps of the breeding soundness evaluation (general physical examination, genital tract examination, semen evaluation and sexual behavior assessment) were analyzed by the Chi-square test and univariate regression analysis. According to year, general physical examination, genital tract examination and semen evaluation determined the rejection of 0.9% to 2.5%, 5.1% to 7.7%, 1.8% to 5.3%; and 4.2% to 6.7%, 7.3 to 9.3%, and 2.5% to 5.5% of young and mature bulls, respectively. Mature bulls presented higher chances of rejection than young bulls in the general physical examination in every year evaluated; as to the genital tract examination, their chances of rejection were higher in years I and II, but not in year III. In the semen evaluation, there was no difference between the ages assessed in any of the three years evaluated. Sexual behavior assessment accounted for the rejection of 1.9 to 6.0% of the young bulls and 2.9% to 3.9% of mature bulls, in accordance with the years evaluated; in years I and II, mature bulls presented higher rejection rates than young bulls. These results confirm the importance of performing all steps of the breeding soundness evaluation, including the sexual behavior assessment as a work routine, rather than an additional, optional stage of the evaluation, which should be carried out before the breeding season. The results indicate the relationship between bull age and rejection rate in the breeding soundness evaluation.

Componentes não-integrantes da carcaça de bovinos de três grupos genéticos terminados em confinamento ou pastejo rotacionado com suplementação

The objectives of this study were to evaluate the effects of cultivation and hay making factors on chemical composition, protein fractionation, and digestibility in rice straw, as well as to identify the chemical fractions that contribute to the variation in its nutritional value for ruminants. Statistical procedures were performed in a model that included rice crop cycle, sowing season, baling season, soil classification, fertilizer application, and productivity (kg/ha) as fixed effects and the hay bale as random effect. Chemical composition, protein fractionation, and digestibility data were subjected to multivariate analyses including factor, cluster, and discriminant. Considering the cultivation and haymaking factors, development cycle, baling season, and grain production explained the most variation in the rice straw nutritional value. Straws derived from early maturing cultivars showed the lowest levels of neutral detergent fiber, acid detergent fiber, acid detergent insoluble nitrogen, and C nitrogen fraction in comparison with straw originating from mid cycle cultivars. Rice straw from more productive cultivars had lower levels of lignin and C fraction as well as higher levels of crude protein and B3 fraction compared with straws from less productive cultivars. However, the main variation in the nutritional value between the samples of rice straw was related to the baling season. The bailing seasons were grouped in two clusters. Straws with better nutritional value were those with lower levels of cell wall fractions, from more productive crops, with early development cycle and baled until March. Rice crop cycle, baling season, and grain production effects explain the variation in the nutritional value of rice straws. Straws with better nutritional value have lower levels of fractions related to secondary cell wall and lignification.

Heat tolerance in Brazilian hair sheep

The objective of this study was to compare physiological and thermographic responses to heat stress in three breeds of cattle. Fifteen animals of each of the Nelore, Pantaneiro and Curraleiro Pe-Duro breeds, of approximately two years of age, were evaluated. Heart and respiratory rates, rectal and surface temperature of animals as well as soil temperature were recorded at 8:30 and 15:30 on six days. Variance, correlation, principal factors and canonical analyses were carried out. There were significant differences in the rectal temperature, heart and respiratory rate between breeds (p < 0.001). Nelore and Pantaneiro breeds had the highest rectal temperatures and the lowest respiratory rate (p < 0.001). Breed was also significant for surface temperatures (p < 0.05) showing that this factor significantly affected the response of the animal to heat tolerance in different ways. The Curraleiro Pe-Duro breed had the lowest surface temperatures independent of the period evaluated, with fewer animals that suffered with the climatic conditions, so this may be considered the best adapted when heat challenged under the experimental conditions. Thermography data showed a good correlation with the physiological indexes, and body area, neck and rump were the main points.

CARCASS CHARACTERISTICS AND MEAT QUALITY IN CULL EWES AT DIFFERENT AGES

The non-carcass components of steers from Brahman, Brangus and Hereford finished in feedlot or pasture with supplementation (mombaca grass) were evaluated. The animals were finished when subcutaneous fat thickness was over 4mm. The feedlot diets have roughage:concentrate ratio of 60: 40, with 13% CP crude protein and 62% TDN. The level of CP of mombaca grass was 7% with 56% TDN, and the supplement was 24% CP and 76% TDN. The experimental design was completely randomized with a 3x2 factorial arrangement (three genetic groups and two finishing systems) and means was compared by adjust Tukey test. Significant difference was observed for the slaughter weight (SW) and empty body weight (EBW) in steers maintained at pasture with supplementation. (409.68 versus 375.24kg of empty body weight), however, no differences were observed with the percentage of empty body dressing percentage (EBD). Brahman steers has the lowest percentage of vital organs independent of finishing system (2.19%). Same trend was showed for the total empty digestive tract with 3.77% for Brahman steers vs 4.87 and 4.48% EBW of Hereford and Brangus. The Brahman steers had lower weights of heart, lung and spleen than the Hereford and Brangus. Animals finished on pasture had greater weight of abomasums lung and kidneys than animals finished on feedlot 0.47 vs 0.35% EBW; 0.77 vs 0.71% EBW and 0.77 vs 0.71% EBW, respectively.