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In vivo fat and muscle weight prediction for lambs from fat- and thin-tailed breeds by real-time ultrasonography

100%

Hajji H., Atti N., Hamouda M. B.

Animal Science Papers and Reports

2015

tom 33

nr 3

The aim of this study was to predict in vivo fat and muscle contents of lambs from a fat-tailed Barbarine and a thin-tailed Noire de Thibar (NT) breeds. The prediction was performed using body weight (BW), carcass weight (CW) and ultrasonic measurements. Ultrasonic measurements included subcutaneous fat thickness (FTh), longissimus dorsi muscle depth (MTh), muscle area (MAr) and circumference (MCir), taken on live animals and on carcasses using a real time ultrasound machine equipped with a 3.5 MHz linear probe. Dissected carcass muscle and fat tissues were weighted and then estimated by developing regression equations. BW was the most important estimator for carcass components for both types of breeds. For the fat-tailed breed, muscle content was better predicted by FTh and fat by MAr. The last with BW the latter explained 77 % of fat variation. For the thin-tailed breed BW and in vivo ultrasonic measurements explained 90 and 88 % of variation for fat and muscle contents, respectively. Rusing carcass ultrasonic measurements with CW mildly improved accuracy relative to BW and in vivo measurements.

Effect of oak acorn (Quercus ilex) intake during suckling and fattening of Barbarine lambs on growth, meat quality and fatty acid profile

76%

Mekki I., Smeti S., Hajji H., Yagoubi Y., Mahouachi M., Atti N.

Journal of Animal and Feed Sciences

2019

tom 28

nr 1

The objective of the present study was to evaluate the effects of oak acorn (Quercus ilex) intake before and after weaning on lamb growth, meat properties and fatty acid (FA) composition. In total 32 Barbarine male lambs were divided into 4 groups, 8 lambs in each. Before weaning, 16 lambs were reared with their dams on range pasture; each mother-lamb pair received 400 g of barley concentrate. The other 16 were reared with their dams on forest pasture; each mother-lamb pair received 300 g of oak acorn concentrate. During the fattening period, lambs were reared in feedlot on one of the 4 dietary treatments – based on concentrate of barley alone or barley plus acorn. Both BarBar and BarAco groups received barley while suckling, and then barley and acorn, respectively, for the fattening period. AcoBar and AcoAco groups received acorn while suckling and then barley and acorn, respectively, for the fattening period. Acorn intake affected neither growth rate nor the physicochemical traits of meat (except pH measured 1 h post mortem). The sum of saturated FA was similar in all groups, whereas C18:0 was higher in AcoAco and BarAco animals (P < 0.01) than in AcoBar and BarBar (about 25 and 22%, respectively). The total monounsaturated FA and polyunsaturated FA did not differ among the groups, except C18:3n-3 which was higher in the AcoAco and AcoBar (P < 0.01) than in BarBar group (0.37 and 0.18%, respectively). The AcoAco group had the highest meat sensory parameters (tenderness, juiciness and general acceptance). So, it may be concluded that ground oak acorn can be used up to 40% in lamb diets without any unfavourable effects on growth performance or meat characteristics.

Ograniczanie wyników

1 Animal Science Papers and Reports

1 Journal of Animal and Feed Sciences

2 Atti N.

2 Hajji H.

1 Hamouda M. B.

1 Mahouachi M.

1 Mekki I.

1 Smeti S.

1 Yagoubi Y.

1 2019

1 2015

Wyniki wyszukiwania

In vivo fat and muscle weight prediction for lambs from fat- and thin-tailed breeds by real-time ultrasonography

Effect of oak acorn (Quercus ilex) intake during suckling and fattening of Barbarine lambs on growth, meat quality and fatty acid profile