Morphofunctional characteristics of Dorper sheep crossed with Brazilian native breeds

Macêdo

et al. 2020

Pesq. agropec. bras.

The objective of this work was to evaluate the allometric growth, the correlation of the cuts with the half carcasses, and the muscularity index of the leg of ½ Dorper + ½ Santa Inês lambs slaughtered with 2.0, 3.0, and 4.0 mm of subcutaneous fat thickness (SFT). Twenty-four non-castrated male lambs were used, being distributed according to their weight into three collective pens. Slaughtering occurred as the lambs reached the SFT predetermined by ultrasound. The half carcasses were weighed, dissected, and separated into five cuts: neck, shoulders, rib, loin, and leg. These cuts were dissected and weighed into muscle, subcutaneous fat, intermuscular fat, and bone. In the shoulders, lambs with 2.0 and 4.0 mm SFT showed early growth. In the rib, this early precocity was observed in lambs with 4.0 mm SFT. The leg showed isogonic growth in lambs with 3.0 and 4.0 mm SFT and was the cut that best correlated with the half carcass, regardless of the SFT. The slaughter of ½ Dorper + ½ Santa Inês lambs with 4.0 mm of subcutaneous fat allows obtaining a better allometric growth of the shoulder, rib, and leg cuts, as well as a better leg muscularity index.

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Allometric growth of ½ Dorper + ½ Santa Inês lambs slaughtered with different subcutaneous fat thicknesses

Macêdo

et al. 2020

Pesq. agropec. bras.

“…A bird's genetic potential for growth can be described in terms of its growth curve (Michalczuk, Damaziak, & Goryl, 2016). Moreover, the same growth curve can be used to define the ideal age of slaughter (Rezende et al, 2020), identify the animals with the best potential for high weight gain, and help define specific nutritional management (Figueiredo et al, 2019;Cyril, Josef, & Widya, 2021). Nonoptimal nutrition, for example, has a significant impact on the chick's development and survival (Prabakar, Pavulraj, Shanmuganathan, Kirubakaran, & Mohana, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The main advantage of this index is its calculation does not require the precise evaluation of individual feed intake, making it accessible to breeders. There are many studies on other livestock species using the KR (Figueiredo et al, 2019;Bangar, Magotra, & Yadav, 2020;Tesema et al, 2020;Yousefi, Gholizadeh, & Hafezian, 2020); however, to our knowledge, there are no studies thus far regarding ostriches or domestic birds in general. This study provides information needed for considering the adoption of this index in ostrich production and other species of domestic birds in the future.…”

Section: Introductionmentioning

confidence: 99%

Kleiber ratios and growth curves of African Black and Red Neck ostrich breeds and their crossbreeds

Rezende¹,

Carneiro²,

Moretti³

et al. 2021

Semina: Ciênc. Agrár.

Self Cite

The selection of animals with lower production costs can be achieved by using feed efficiency and growth curve information. Kleiber ratio (KR) is an alternative option for discriminating against the animals that have the greatest weight gain about their final weight. Alternative feed efficiency and growth curves for ostriches of the African Black (AB) and Red Neck (RN) breeds and their crossbreeds (CB) were investigated using KR and Gompertz equation. Univariate and multivariate analyses were used. The highest adult weight was identified in the RN and CB. AB was more precocious than the RN and CB individuals. Only AB animals reached 75% of their mature weight at one year of age. At 180 days, AB showed better KR. AB was different from the others, mainly for KR at 90 days and 180 days. Considering multivariate analysis, AB animals were different from the others, regardless of sex, mainly for KR at 90 days and KR at 180 days. Other subgroups separated the animals by sex. In a market preferring animals of minor structure (smaller cuts) and greater precocity, it would be suitable to opt for AB. When animals with greater body structure (larger cuts) are desired, males RN and CR is the best option, however, it will be slaughtered with greater age and lower value for KR (may generate a bigger production cost ). It is possible to obtain animals with precocity and high KR, being well represented by the AB breed.

“…Una de las estrategias en la búsqueda por ovinos de buena adaptación al clima y de alta producción es la combinación de genotipos mediante el cruzamiento. El uso de diferentes genotipos permite a los productores a optar de acuerdo a su objetivo de producción e infraestructura disponible, una vez que diferentes genotipos presentan variabilidad en la adaptación, conformación de la canal y madurez a diferentes edades de faena (3). El genotipo influencia en el aumento de peso y en las características cuantitativas de la canal, demostrando así que los cruces en los ovinos son necesarios para explorar la complementariedad de las razas y la heterosis es necesaria para lograr el mejor rendimiento y características deseables de la canal (4) y explorar positivamente los atributos de calidad de la carne (5).…”

Section: Introductionunclassified

Canal y carne de corderos Santa Inés y cruces con Dorper o Texel: Un meta-análisis

et al. 2020

Objetivo. Evaluar las características cuantitativas de la canal y composición química de la carne de corderos puros Santa Inés (SI) y cruces con Dorper (DO-SI) o Texel (TX-SI), terminados en confinamiento, mediante un meta-análisis. Materiales y métodos. Bases de datos virtuales como Google Scholar, Science Direct y Scielo fueron utilizados para seleccionar los artículos cientifícos publicados desde el año 2000 a 2019. Palabras clave como genotipo, corderos, características de la canal y calidad de la carne, tanto en idioma español, portugués e inglés fueron utilizadas como criterios de inclusión de los artículos. De cada grupo genétipo, fueron evaluados: desempeño animal, características cuantitativas de la canal, cortes de la canal y composición química de la carne. Todos fueron incluidos en el análisis proveniente de 36 artículos científicos. Resultados. Peso corporal final, peso de la canal caliente, rendimiento de la canal fría y porcentaje de músculo no difieren entre los diferentes genotipos evaluados. Corderos DO-SI presentaron mayor consumo de materia seca, ganancia diario de peso, área de ojo de lomo y porcentaje de lomo. Composición química no fue influenciada por los genotipos. Conclusiones. En ambiente tropical y subtropical, corderos puros SI terminados en confinamiento presentan características cuantitativas de la canal y composición química similar a los corderos de cruces DO-SI y TX-SI.