Fifth European Dirofilaria and Angiostrongylus Days (FiEDAD) 2016

Peer reviewe

Slaughter value of domestic breed of lambs managed under free- range system at valuable natural areas

Celem pracy była analiza wartości rzeźnej tryczków rasy świniarka ze stada utrzymywanego w warunkach chowu wolnego w celu czynnej ochrony środowiska. Materiał badawczy stanowiło 6 tryczków w wieku około 7-8 miesięcy wybranych ze stada owiec rasy świniarka, objętego Programem Ochrony Zasobów Genetycznych Zwierząt Gospodarskich w Polsce. Wydajność rzeźna badanych jagniąt była niska i wynosiła 36,1%.Wyręby cenne stanowiły 40,0% tusz, a w składzie udźca stwierdzono 66,1% tkanki mięśniowej oraz jedynie 5,8% tkanki tłuszczowej. Całościowa analiza przedstawionych wyników wskazuje, że tuszki jagniąt rasy świniarka pochodzące od zwierząt utrzymywanych w systemie chowu wolnego charakteryzują się bardzo niskim otłuszczeniem, a także słabszym umięśnieniem.The objective of the research was to analyze slaughter value of young rams Swiniarka breed maintained under free-range production system contributing to active conservation of environment. The research object comprised 6 young rams aged 7-8 months chosen from a Swiniarka breed sheep flock included in the Conservation of Farm Animal Genetic Resources Program in Poland. Slaughter value of the lambs under study was low – 36.1%. Valuable cuts accounted for 40.0% of carcasses, hind leg composition showed 66.1% of muscle tissue and only 5.8% of adipose tissue. The overall analysis of the presented results indicate that carcasses of Swiniarka breed lambs obtained from animals managed under free-range production system are characterized by very low adiposis and relatively poorer muscularity

Measurement of rib-eye area by the method of digital images

This study evaluated the correlation between measurements of rib-eye areas of sheep carcasses by traditional methods and those obtained by scanned images. Thirty pictures of the longissimus dorsi muscle of sheep carcasses were drawn on tracing paper and analyzed for muscle area (rib-eye) using four methods: scanned images, which utilizes the software DDA -Determinador Digital de Áreas (Digital Area Determiner); measurements "A" and "B" applied to the equation: (A/2 × B/2) × π; Planimeter method and rib-eye grid method. All rib-eye area figures were measured five times by each method, setting up a completely randomized experiment with four treatments and five replicates. Data were submitted to analysis of variance and means were compared by the Tukey test, Pearson correlation and linear regression by the SAS software. Easiness and difficulties perceived by the evaluators in the performance of each method were also recorded. The method of scanned images analyzed by the software DDA showed high correlation with the methods traditionally used, and can be considered feasible to determine carcass rib-eye area, with the advantage of being easy to operate, flexible, and economical

Características de carcaça determinadas por ultrassonografia em tempo real e pós-abate de cordeiros terminados em confinamento com diferentes níveis de energia na dieta¹ Carcass traits determined by ultrasonography in real time and after slaughter of lambs finished in fedlot with diferent levels of energy in the diet

Objetivou-se avaliar as características de carcaça por ultrassonografia em tempo real e após o abate e a relação entre essas características e os rendimentos de carcaça de cordeiros de diferentes genótipos terminados em confinamento com diversos níveis de energia na dieta. Foram utilizados 54 cordeiros não-castrados - 18 Santa Inês puros (SI), 18 ½Dorper x ½Santa Inês (Dp x SI) e 18 ½Santa Inês x ½Sem Raça Definida (SI x SRD) - com média de 150 dias de idade e peso médio de 22,60 kg no início do experimento. As dietas continham 17% de proteína bruta e 2,40 Mcal/kg MS e 2,90 Mcal/kg MS. As mensurações realizadas por ultrassonografia e diretamente na carcaça dos cordeiros apresentaram resultados similares. Os cordeiros alimentados com a dieta contendo 2,90 Mcal/kg apresentaram maior área de olho-de-lombo, melhor conformação e acabamento de carcaça e maior quantidade de gordura pélvico-renal. Os cordeiros Dp x SI apresentaram maior área de olho-de-lombo e musculosidade por 100 kg de PV em comparação aos SI x SRD e foram superiores a todos os genótipos quanto à espessura de gordura subcutânea, à conformação e ao acabamento de carcaça. O marmoreio observado nos cordeiros Dp x SI foi superior aos dos Santa Inês. As correlações das medidas tomadas por ultrassonografia e na carcaça foram altas e significativas, exceto o marmoreio. Houve correlação significativa entre conformação da carcaça e acabamento, marmoreio, espessura de gordura subcutânea e gordura pélvico-renal. As gorduras de cobertura avaliadas subjetivamente e objetivamente apresentaram correlações altas e significativas. A dieta e o genótipo influenciam as características de carcaça de cordeiros.<br>The objective of this study was to evaluate carcass traits through ultrasonography in real time and after slaughter and the relationship between these traits and carcass yields of lambs with different genotypes finished in feedlot with several levels of energy in the diet. It was used 54 non-castrated lambs: 18 pure Santa Inês (SI), 18 ½Dorper x ½Santa Inês (Dp x SI) and 18 ½Santa Inês x ½ Without Standard Defined Breed (SI x WSDB), at an average age of 150 days and at an average body weight of 22.6 kg at the beginning of the experiment. Diets contained 17% of crude protein, 2.40 Mcal/kg DM and 2.90 Mcal/kg DM. Measurements made by ultrasonography and directly on carcass of the lambs showed similar results. Lambs fed diets containing 2.90 Mcal/kg showed larger loin eye area, better carcass conformation and finishing and higher amount of pelvic-renal fat. Lambs Dp x SI showed larger loin eye areas and muscularity per 100 kg of body weight in comparison to SI x SRD lambs and they were superior to all genotypes regarded to subcutaneous fat thickness, conformation and finishing carcass. Marbling observed in Dp x SI lambs were superior than in Santa Inês lambs. Correlations of measures taken by ultrasonography and on the carcass were high and significant, except marbling. There was a significant correlation among carcass conformation and finishing, marbling, subcutaneous fat thickness and pelvic-renal thickness. Backfat subjectively and objectively evaluated showed high and significant correlations. Diet and genotype influence characteristics of carcass of lambs