Residual intake and gain for the evaluation of performance, non-carcass components, and carcass characteristics of confined crossbred Texel lambs

Abstract

We evaluated performance, non-carcass components, and carcass characteristics of crossbred Texel lambs in different categories of residual intake and gain (RIG). We assessed 77 crossbred (¼ Pantaneira and ¾ Texel) non-castrated animals in two study phases. The first phase included 47 lambs with an initial average weight of 29.9±5.5 kg, and the second phase included 30 lambs with initial average weight of 22.4±3.3 kg. Dry matter intake (DMI) and average daily gain (ADG) were evaluated for 70 days. Animals were divided into three groups in terms of efficiency: efficient (high RIG), intermediate (medium RIG), or inefficient (low RIG), based on the standard deviation of the mean for the RIG variable. We measured the yield of noncarcass components, carcass characteristics, and yield of meat cuts. Efficiency group had no association with DMI, nor with initial and final body weights of the animals. The ADG of efficient (0.310 kg day −1 ) and intermediate (0.290 kg day −1 ) animals was greater than observed in inefficient (0.260 kg day −1 ) animals. Lambs in the efficient and intermediate groups had significantly higher levels of all efficiency indicators evaluated. Efficient and intermediate animals yielded significantly more wool/skin in comparison with lambs in the inefficient group. Animals with high RIG also had lower relative weight of testicles/scrotal sac in comparison with inefficient animals. Fat deposition in the omentum and mesentery as well as total fat were decreased in efficient animals. No significant differences occurred among groups regarding carcass characteristics and yield of meat cuts. The RIG index allows for the identification of lambs with higher growth rates and greater wool/skin yield and lower proportion of visceral fat.

Growth performance, carcass traits, meat quality, and blood variables of small-sized meat ducks with different feed efficiency phenotypes

“…In addition to improved performance, efficient ducks should have acceptable carcass production and quality. Prior research has sought to link animal performance and carcass traits to RIG levels ( Carneiro et al, 2019 ). However, data on poultry breeds are scarce.…”

Composição e qualidade da carcaça de ovinos com diferentes pesos corporais ao abate

“…Em ovinos de corte, busca-se o máximo de carcaça e o mínimo de não-constituintes da carcaça, prontamente, o máximo de rendimento de carcaça. Os RCQ foram entre 47,11 e 51,16% e os RCF entre 45,43 e 49,38%, (Gráfico 1) e, estão dentro da faixa de valores normalmente encontrados para ovinos no Brasil (CARNEIRO et al, 2019, REGO et al, 2019.…”

Índices de eficiencia alimenticia en ovinos de pelo: calidad de la carne y genes asociados. Revisión

“…El nuevo índice GIR, además de tener como ventaja la mejora en la eficiencia en la alimentación, permite identificar animales con mayores tasas de crecimiento y una menor proporción de grasa, sin afectar la calidad de la carne y canal; reduciendo los tiempos de confinamiento y sacrificio de los animales, con pesos comerciales a edades tempranas (36) .…”

“…Los estudios que involucran los índices CAR y GIR, han sido realizados principalmente en especies bovinas, porcinas y aves. En el caso de ovinos se han realizado en razas de clima templado; aunque, se han reportado cuatro estudios que involucran cruzas de ovinos de pelo de la raza brasileña, destacando la raza Santa Inés y Pantaneira (5,36,37,38) , y un estudio en la raza Dorper (39) (Cuadros 1 y 2). En México se comienza a implementar esta herramienta por lo que el número de estudios es reducido, y en ovinos solo se tiene el trabajo realizado con la raza Rambouillet (40) , por lo que se desconoce el comportamiento en los ovinos de pelo (Cuadro 1).…”

“…Empleando el índice GIR en los estudios realizados en ovinos (5,36,38) , se observa que los ovinos clasificados con un alto GIR presentan un menor CMS, mayor GDP, menor CA y mayor eficiencia alimenticia (EA) (Cuadro 2). Aunque la diferencia en el CMS no es tan amplia como en la observada con el CAR, en la GDP se observa una diferencia de hasta 50 g día -1 .…”