Effect of breed on mineral composition of meat from light lambs (original) (raw)
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Carcass quality and physico-chemical characteristics of meat of light lambs
The quality of 40 carcasses of light lambs of synthetic population of the Slovak Dairy sheep from artificial rearing (AR) and traditional rearing (TR) systems was assessed on the basis of growth and carcass traits, and physico-chemical characteristics. Weights before starvation and at slaughter were similar in AR and TR lambs, respectively. The significant difference was found only in age. The significantly lower (P < 0.01) average daily gain was found in AR lambs (0.215 kg). Hot carcass weight, hot and cold dressing percentage was also lower in AR lambs (8.1 kg, 47.1 % and 45.7 %). Weights of internal organs were lower in TR lambs (except for testicles). Proportion of commercial joints in left carcass half was the same (anterior-rib 7.1 %), slightly lower (neck 5 %, loin 13.2 %), or slightly higher in TR lambs (breast plus flank 20.4 %, leg 34.5 %, shoulder 19.8 %). First and third quality meat percentages did not differ significantly; second quality meat percentage was significantly higher (P < 0.01) in TR lambs (26.9 %). Muscle percentage in left carcass half was significantly higher (P < 0.001) in TR lambs (63.5 %), whereas percentage of fat (11.4 %) and of bone (29.2 %) in left carcass half were almost significantly (P = 0.065) and significantly (P < 0.01) higher in AR lambs. Electric conductivity and water holding capacity were found significantly different (P < 0.01) between AR and TR lambs (lower values were found in MLD of TR lambs) as concerned physico-chemical characteristics which were measured on samples taken from Musculus longissimus dorsi (MLD). Protein content tended to be higher (P = 0.0513) in MLD of TR lambs (20.62 g 100 g-1).
Asian-Australasian journal of animal sciences, 2014
The objective of this study was to investigate the effect of maintenance system as well as the effect of Se, Zn, and vitamin E supplementation of ram-lambs on the slaughter value and concentration of mineral elements in the loin muscle of lambs. The experiment was conducted on 72 Polish Merino ram-lambs divided into three groups: group C, indoor with no supplement, 19 lambs; S, indoor with supplement, 23 lambs; G, outdoor with no supplement, 30 lambs. From birth all the lambs were maintained indoor with their dams and then weaned at the age of 8 weeks. The rams from group C and S were placed in individual straw-bedded pens and fattened individually with concentrate mixture offered ad libitum until the age of 16 weeks. The lambs from group G were grazed every day from May to July (2 months). During the fattening period each lamb from the supplemented group S was administered per os 1 mL 0.1% Na2SeO4 (Se, 0.42 mg), 3 mL 10% ZnSO4 (Zn, 68 mg), and 1 mL premix protect vitamin E (0.1 g α...
Animal science papers and reports
The objective was to investigate the effect of sex and slaughter weight on muscle fibre and meat quality traits of longissimus thoracis (LT) muscle in lambs. Used were 22 female and 30 male lambs of Polish Longwool sheep from two slaughter weight groups: I -15-20 kg and II -25-30 kg. LT muscle samples were taken to categorize fibre types (I, IIA and IIB) according to their NADHtetrazolium reductase activity and to determine the pH 24 , colour L*a*b*, drip loss, thermal loss, and Warner-Bratzler shear force of meat. Fibre type percentage, fibre diameter and phenotypic correlation between fibre traits and meat quality traits were estimated. Sex and slaughter weight had no effect on muscle fibre types percentage, but affected the diameter of fibres. Likewise, pH 24 , drip loss and thermal loss were not affected by these two factors. On the other hand, in males compared to females and with increasing slaughter weight, meat lightness decreased, whereas shear force values and diameter of muscle fibres increased. The phenotypic correlations between histological and meat quality traits were generally low. The percentage of type I, unlike that of type IIB fibres, positively correlated with meat pH 24 and shear force, while negatively with meat lightness. Meat yellowness was positively related to percentage of type IIB fibres. A trend was found between redness and percentage of type I fibres. Moreover, increased diameter of type IIB fibres was found to be related to the increased shear force values.
Italian Journal of Animal Science
This study aimed at estimating the trace minerals net requirements for maintenance and growth of Dorper  Hu ram lambs using the comparative slaughter techniques in 35 lambs of 35-50 kg body weight (BW). Seven lambs were slaughtered at the initial BW (34.93 ± 0.37 kg) to determine the basal whole-body composition. Another seven lambs were fed ad libitum (AL) and then slaughtered when it reached 41.73 ± 0.53 kg BW. The remained 21 lambs were assigned into three treatment groups, seven animals each, and fed 100, 70 or 40% of AL intake, respectively, and were slaughtered when they reached a BW of 49.93 ± 1.03 kg. The net requirements of maintenance were 5.1, 429.3, 94.0 and 48.8 mg/kg empty BW (EBW) for Mn, Fe, Zn and Cu, respectively. The net requirements of growth at 35 kg BW were 0.86, 70.41, 33.46 and 4.31 mg/ kg EBW for Mn, Fe, Zn and Cu, respectively. At a BW of 50 kg, the net growth requirements were 0.93, 68.40, 35.20 and 4.15 mg/kg EBW for Mn, Fe, Zn and Cu, respectively. Our data indicated that the Mn and Zn requirements increase, whereas those of Fe and Cu decrease when BW increases. In addition, the net Cu, Mn and Fe requirements for maintenance and Zn, Cu, Mn and Fe requirements for growth of Dorper  Hu hybrid ram lambs were higher than those reported in the NRC but Zn requirements for maintenance matched that of the NRC. HIGHLIGHTS Trace minerals requirements for maintenance and growth vary with sheep genotype or breed. The comparative slaughter method could be a reliable tool for estimating the net requirements of trace minerals in Dorper  Hu ram lambs. Our estimated values for maintenance (Cu, Mn and Fe) and growth (Zn, Cu, Mn and Fe) requirements were higher than those reported in the NRC (2007).
The Effect of Live Weight at Slaughter and Sex on Lambs Carcass Traits and Meat Characteristics
2000
Twenty-eight (12 male and 16 female) of improved Jezersko-solèava lambs with Romanov (JSR) were used to evaluate the effect of live weight and sex on carcass traits and meat quality. Lambs were weaned at around 60 days of age. They were fed with commercial concentrate and hay ad libitum and slaughtered at 29 kg or 43 kg of average live weight at 105 or 126 days of age. Daily gain from birth to slaughter was higher than 300 g/day and was very similar for both groups. There were no differences between light and heavy lambs in carcass conformation and dressing percentage. Heavy lambs were longer, wider and fatter. The difference in lungs, head and pelt percentage were statistically significant. With increased live weight at slaughter the percentage of neck, back and rib with flank increased and chuck, shoulder and hindleg decreased. Muscle percentage in hindleg increased and bone percentage decreased as live weight increased. Considering meat quality, heavier lambs had lower lightness and higher redness. Lighter lambs had higher pH 45 value. Differences between sexes were statistically significant for dressing percentage and carcass fatness with higher values for females. Males had higher percentage of liver and head, higher proportion of neck, chuck and shoulder and lower proportion of back and loin. Males tended to have higher values for muscle and bone proportion, and lower proportion of fat in hindleg. Males had lighter meat. Sex had no effect on pH values.
Archives Animal Breeding, 2013
The objective of this study was to evaluate the influence of supplemental dietary selenium (Se) and magnesium (Mg) on feedlot lambs. Sixty-four male lambs were randomly distributed to the following treatments: 1) low level of Mg and Se: diet with 0.18 % of Mg and 0.1 µg Se/g, 2) with supplementation of magnesium oxide (MgO): diet with 0.32 % of Mg and 0.1 µg Se/g, 3) with supplementation of Sodium selenite (Na 2 SeO 3): diet with 0.3 µg Se/g and 0.18 % of Mg, 4) With supplementation of MgO and Na 2 SeO 3 : diet with 0.32 % of Mg and 0.3 µg Se/g. There were no differences (P>0.05) in the average daily gain and feed conversion but Se supplement with Na 2 SeO 3 (0.3 µg Se/g) enhanced dry matter intake, dressing percentage (P<0.05) and leg muscle weight (P<0.02). The average values of the water retained potential, coordinate L, a, and sensory analysis were different with Se (P<0.05). Magnesium suplemented as inorganic source (0.32 % of Mg) enhanced (P<0.05) some characteristics in sensorial meat analysis.
CZECH JOURNAL OF …, 2006
Forty male lambs of the mountain Greek breed were used to evaluate the effect of age at slaughter on carcass characteristics and composition. The slaughter of lambs was carried out at the age of 30, 45, 60, 75 and 90 days. The slaughter procedure, carcass dissection and carcass composition were realized according to the standard method of CIHEAM-AGRIMED programme. The results of this work showed that the lambs of different age groups did not differ in dressing percentage significantly. The proportion of muscles showed a tendency of increase with the increasing slaughter age but the differences were not significant. The proportion of total fat in carcass increased with the increasing slaughter age from 20.84 to 23.59% for the age group of 30 and 90 days, respectively (P < 0.05). On the contrary, as the age at slaughter increased, the proportion of bones decreased (P < 0.05). Subcutaneous, intermuscular, perinephric and pelvic fats increased with the slaughter age, but only the subcutaneous fat was influenced significantly (P < 0.05). Among the different commercial cuts proportions of long leg, first 5 ribs and shoulder decreased, while those of last 8 ribs-loin and breast-flank increased (P < 0.05). The overall results suggest that the slaughter age of lambs of the mountain Greek breed should be increased from the present ~45 days to more advanced age of 75 or 90 days in order to improve the farmers' profits without serious negative effects on the quality of carcasses or meat of lambs.
The effect of genotype, feeding system and slaughter weight on the quality of light lambs
Livestock Production Science, 2002
One-hundred and eight Merino Branco (MB) and crossbred Ile de France x Merino Branco (IFxMB) ram lambs were used to evaluate the effects of genotype, feeding system and slaughter weight on growth, carcass composition and meat quality traits. At an average age of 53 days, lambs were randomly assigned to three feeding systems: P, pasture with dams; SP, pasture with dams, plus concentrate ad libitum; C, weaning, and concentrate ad libitum. Lambs were slaughtered at 24 or 30 kg live weight. The carcass left sides were partially dissected and the Longissimus thoracis and Longissimus lumborum muscles were used for meat quality determinations. Genotype had only minor effects on lamb growth as well as on carcass composition and meat traits. Growth rate was higher, and muscle proportion was lower in C than in SP, and in SP than in P. When lambs were fed only pasture (P), carcasses were mainly classified as very lean (class 1), especially when lambs where slaughtered at 24 kg. For SP and C, carcasses were mainly graded in class 2. Lambs in P, showed lower water-holding capacity. When slaughter weight increased, muscle proportion decreased but carcasses were still considered to be lean (class 2). Meat colour became darker and redness increased with slaughter weight, but shear force remained unchanged.