Carcass composition and meat quality of Czech genetic resources of nutrias (Myocastor coypus)

Abstract

ABSTRACT:The effects of sex and colour type on carcass composition, nutrients content, and muscle fibre characteristics of hind leg meat of nutrias raised under intensive conditions were the focus of this study. Thirtysix eight-month-old nutrias of both sexes with three colour types (Standard nutria, ST; Moravian Silver, MS; and Prestice Multicolour, PM) were studied. Live weight was affected by colour type (P < 0.05) and sex (P < 0.001); however, no effects of these variables were found for the dressing out percentage. Crude protein content was significantly higher in males than in females, whereas crude fat content was higher in females. A significant interaction between colour type and sex was found for hydroxyproline and ash contents. Fatty acids were affected primarily by the sex of nutrias. No effect of colour type on the distribution of muscle fibres in the Biceps femoris muscle was found. However, females had fewer βR (P < 0.05) and more αR fibres (P < 0.001) than males.

Growth, carcass value and blood biochemical parameters of Czech Genetic Resources of nutria (Myocastor coypus)

“…Feed intake was higher in males. Dressing out percentage was not affected by the colour type or sex, Tůmová et al (2015) reported higher values in males. The hind leg meat weight was affected by the interaction of colour type and sex (P≤0.009) with the highest weight in males MS and PV (544 g) and the lowest in females MS (301 g).…”

“…U jednotlivých partií jatečně opracovaného trupu jsou v literatuře dostupné pouze podíly, nikoli však hmotnosti. Podíl zadní části a stehen byl vyšší u samic (Tůmová et al, 2015). Podobně jako u předchozích ukazatelů tak i podíl masa stehen byl vyšší u samic (Tůmová a Hrstka, 2013).…”

Body size and gastrointestinal morphology of nutria (Myocastor coypus) reared on an extensive or intensive feeding regime

“…Relationship between age and body weight in nutria (Myocastor coypus) males and females maintained either on an extensive (ERF) or intensive (IFR) feeding regime (lower figure represents longer time window). Grey data points without border represent literature data on intensively reared animals (Niedźwiadek et al, 1987a;Niedźwiadek and Piórkowska, 1993;Sirotkin et al, 2003;Cabrera et al, 2007;Beutling et al, 2008;Tůmová et al, 2015;Tůmová et al, 2017), the black and dotted lines represent growth curves for free-ranging males and females, respectively (Dixon et al, 1979), the small black symbols represent free-ranging animals from Sherfy et al (2006), and the crosses represent free-ranging animals of unknown sex from Peloquin (1969) in which an increase in body weight in the spring (1 yr after birth) from the extensive feeding regime (EFR) level to the intensive feeding regime (IFR) level is visible. production, but for general concepts on the determinate growth of endotherms.…”

“…For comparative purposes, data on age and BW were plotted against literature data on nutria from the wild (Peloquin, 1969;Dixon et al, 1979;Willner et al, 1980;Sherfy et al, 2006) and intensive rearing systems (Niedźwiadek et al, 1987a;Niedźwiadek and Piórkowska, 1993;Sirotkin et al, 2003;Cabrera et al, 2007;Beutling et al, 2008;Tůmová et al, 2015;Tůmová et al, 2017).…”