Variability in subcutaneous fat composition of Iberian pigs reared in free-range conditions in the southwest of the Iberian Peninsula

2020 ◽  
Vol 100 (4) ◽  
pp. 665-673
Author(s):  
J.F. Tejeda ◽  
A. Hernández-Matamoros ◽  
J.M. García-Cascos ◽  
E. González
Keyword(s):  
Iberian Peninsula ◽  
Dry Matter ◽  
Subcutaneous Fat ◽  
Live Weight ◽  
Quercus Suber ◽  
Relative Area ◽  
Free Range ◽  
Fat Composition ◽  
The Relationship ◽  
Quercus Rotundifolia

A total of 80 free-range Iberian pigs reared with acorns and grass in eight different free-range systems (n = 10) in the southwest of the Iberian Peninsula were used to determine the relationship between fatty acid, tocopherol, and neophytadiene subcutaneous fat composition. The pigs were fed extensively for 79.1 ± 9.5 d from 110.9 ± 11.9 kg live weight at the beginning of the final fattening phase to 175.0 ± 15.9 kg slaughtered weight. Quercus suber and Quercus rotundifolia acorns were characterised by a high content of C18:1n-9 (58.3 and 63.1%, respectively) and γ-tocopherol [43.7 and 43.0 mg kg−1 dry matter (DM), respectively], while grass exhibited a high content of C18:3n-3 (42.5%), α-tocopherol (366.5 mg kg−1 DM) and neophytadiene (136.2 relative area units). The C18:1n-9 (54.4%–57.7%) and γ-tocopherol (2.7–4.1 mg kg−1 DM) contents in subcutaneous fat from Iberian pigs differed (p < 0.001) between the free-range systems studied. Pasture intake had a significant effect (p < 0.01) on subcutaneous fat content of C18:3n-3 (0.5%–0.8%), α-tocopherol (7.8–13.1 mg kg−1 DM) and neophytadiene (2.6–6.3 relative area units). However, the results demonstrated no correlations between accumulated levels of these compounds throughout the free-range period. In conclusion, the absence of correlations corroborated the heterogeneity of extensive rearing systems, with variations between years and geographical areas where the Iberian pigs were reared.

Prediction of the voluntary intake of grass silages by beef cattle. 1. Linear regression analyses

1990 ◽  
Vol 50 (3) ◽  
pp. 425-438 ◽  
Author(s):  
A. J. Rook ◽  
M. Gill
Keyword(s):  
Dry Matter ◽  
Volatile Fatty Acids ◽  
Live Weight ◽  
Ammonia Nitrogen ◽  
Dry Matter Intake ◽  
Digestible Organic Matter ◽  
Voluntary Intake ◽  
Relationship Of ◽  
The Relationship ◽  
Linear Regressions

ABSTRACTData on individually recorded silage dry-matter intake (SDMI), concentrate dry-matter intake (CDMI) and live weight of steers and data on silage composition including toluene dry matter (TDM), pH, total nitrogen (N), ammonia nitrogen (NH3-N), volatile fatty acids (VFAs), digestible organic matter in the dry matter (DOMD) and neutral-detergent fibre (NDF) obtained from experiments conducted at three sites were used to obtain simple and multiple linear regressions of SDMI on other variables.Live weight accounted for a high proportion of the variation in intake but this effect could generally be removed by scaling intake by live weight raised to the power of 0·75 (M0·75). CDMI was the most important factor affecting scaled intake in mixed diets. TDM, NH,-N and VFAs all had important effects on SDMI. The relationship of SDMI with TDM was curvilinear suggesting that there is little to be gained in intake terms from wilting to TDM above 250 g/kg. The effect of NH3-N appeared to be related more to its correlation with VFAs than with any other nitrogenous constituent while the VFAs appeared to have a direct effect on SDMI. The effects of N and pH on SDMI were generally small. DOMD and NDF had relatively little effect on SDMI. Significant differences in intercepts between sites were found for most relationships although common slopes were often found.

Relationship between dry matter, fibre and nitrogen degradation characteristics of silage and silage intake of steers

2000 ◽  
Vol 70 (3) ◽  
pp. 537-546 ◽  
Author(s):  
L.E.R. Dawson ◽  
R.W.J. Street
Keyword(s):  
Dry Matter ◽  
Live Weight ◽  
Ammonia Concentration ◽  
Fibre Concentration ◽  
The Poor ◽  
Acid Detergent Fibre ◽  
Highly Correlated ◽  
The Relationship ◽  
Poor Relationship

AbstractA study was carried out to examine the relationship between silage intake and rumen degradability characteristics of silage. The dry matter (DM), neutral-detergent fibre (NDF), acid-detergent fibre (ADF), hemicellulose and nitrogen (N) degradability characteristics of 136 silages were determined using polyester bags in three rumen fistulated beef cross steers. The bags were incubated for 0, 6, 12, 24, 48 and 72 h. Intakes of these silages, by steers, were reported by Steen et al., 1998. The relationships between silage DM intake (g/kg metabolic live weight) and DM, fibre and N degradability characteristics of the silages were poor (R2 < 0·32). Degradability characteristics of the silages were highly negatively correlated with fibre concentration of the silages (R < –0·82) and highly positively correlated with the soluble N minus ammonia concentration (R < 0·77). Some of the degradability characteristics were highly correlated with organic matter digestibility, particularly the proportion of DM, fibre and N degraded after 72 h (R = 0·75 to 0·85). In view of the poor relationship between silage intake and degradability, the results of this study question the rôle of degradation characteristics of DM, fibre and N in the rumen on silage intake.

scholarly journals Copper, iron, manganese and zinc concentrations in the carcases of lambs and calves and the relationship to trace element requirements for growth

1979 ◽  
Vol 42 (1) ◽  
pp. 89-96 ◽  
Author(s):  
N. F. Suttle
Keyword(s):  
Dry Matter ◽  
Live Weight ◽  
Tissue Storage ◽  
Growth Requirements ◽  
Fe And Mn ◽  
Zinc Concentrations ◽  
The Mean ◽  
Daily Intakes ◽  
Iron Manganese ◽  
The Relationship

1. The minced carcases of twenty-seven lambs, ranging from 18 to 69 kg in live weight, and twenty-five calves (30–90 kg) were analysed for copper, iron, manganese and zinc. The lambs were weaned whereas the calves were reared exclusively on milk.2. Mean concentrations of Fe, Mn and Zn for groups of lamb carcases fell within the ranges 52.6–75.1, 0.7–1.2 and 20.8–25.6 mg/kg fresh carcase weight respectively. The concentrations of Fe and Mn decreased while that of Zn increased slightly with age at slaughter. The concentrations of Fe, Mn and Zn in calves were close to thosein lambs.3. For both species, the concentration of Cu in the carcase varied erratically: variation in hepatic Cu storage was implicated. In an additional study of ten full-term foetuses from Cu-depleted or Cu-supplemented ewes, a dietary Cu supplement (10 mg/kg dry matter (DM)) increased foetal Cu status 10-fold, due largely to an increase in foetal liver Cu.4. The mean retentions of trace elements in the lamb carcases (%intake) were approximately: Cu 2.0, Fe 1.3, Mn 0.08, Zn 4.0. The corresponding values for the milk-fed calves were all probably much higher (Cu 23, Fe 43.7, Mn 4.9, Zn 34.0) but Cu intake was not accurately measured.5. After allowing for tissue storage of Fe and Mn, values of 55, 0.85 and 24 mg/kg carcase gain were taken to represent the approximate net growth requirements of lambs for Fe, Mn and Zn respectively: the corresponding value for Cu was probably < 1.0 mg/kg. Values for calves were similar to those for lambs.6. It was concluded that the total net requirements of ruminants for Fe and Zn shouldbe considered in terms of daily intakes of the metans rather than dietary concentrationsbecause of the relatively large and constant contribution of the growth component to thetotal requirement.

A note on the relationship between ultrasonic fat measurement and performance in beef cattle

1978 ◽  
Vol 27 (1) ◽  
pp. 109-112
Author(s):  
J. B. Moran ◽  
W. Holmes
Keyword(s):  
Subcutaneous Fat ◽  
Live Weight ◽  
Performance Parameters ◽  
Feed Conversion ◽  
Rate Of Increase ◽  
Breed Differences ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
And Performance ◽  
The Relationship

ABSTRACTThe development of subcutaneous fat as measured by ultrasonics was determined in 28 Angus, 46 Hereford and 42 Charolais bulls, performance-tested on a barley/grass diet. The ultrasonic fat measurements were then examined for possible relationships with feed intake, growth rate and feed conversion efficiency. There were apparent breed differences in the rate of increase in subcutaneous fat thickness with changing live weight but ultrasonic measurements bore little relationship to performance parameters within any of the three breeds tested.

Comparison of boars and castrates for bacon production 2. Composition of muscle and subcutaneous fat, and changes in side weight during curing

1982 ◽  
Vol 35 (1) ◽  
pp. 65-74 ◽  
Author(s):  
J. D. Wood ◽  
M. Enser
Keyword(s):  
Dry Matter ◽  
Subcutaneous Fat ◽  
Live Weight ◽  
Subjective Assessment ◽  
Lower Proportion ◽  
Carcass Composition ◽  
Hybrid Male ◽  
Tissue Water ◽  
Tissue Protein ◽  
Different Levels

ABSTRACTSixty-four commercial hybrid male pigs given different levels of feeding between 27 and 87 kg live weight were used to determine whether quality differences between boars and castrates, when used for bacon production, are true castration effects or due to the greater leanness of boars. At the same carcass composition as castrates, boars had: a higher proportion of water in m. longissimus; a higher proportion of water and lower proportion of lipid in both layers of backfat at last rib; and slightly lower curing gain as the result of a greater loss of tissue water during curing. A separate study on the composition of backfat in lighter weight pigs also revealed a higher proportion of water and lower proportion of lipid in boar backfat compared with that of castrates or gilts, and in both studies a higher proportion of fat-free dry matter in boar backfat indicated greater synthesis of connective tissue protein. Subjective assessment of backfat firmness and whiteness revealed no important castration effects that were independent of carcass composition. The leanest group of boars (average 12 mm P2) had the lowest score for firmness. Fatty acid composition of outer and inner backfat layers was determined more by the rate of fat deposition than by castration.

Growth changes in the distribution of dissectable and intramuscular fat in pigs

1977 ◽  
Vol 89 (2) ◽  
pp. 257-266 ◽  
Author(s):  
A. S. Davies ◽  
W. J. Pryor
Keyword(s):  
Dry Matter ◽  
Subcutaneous Fat ◽  
Live Weight ◽  
Intramuscular Fat ◽  
Fat Content ◽  
Large White ◽  
Growth Series ◽  
Fat Depots ◽  
Total Fat ◽  
Muscle Groups

SummaryThe subcutaneous, intermuscular and cavity fat depots of the half carcasses of 15 Large White × Landrace castrated male pigs, forming a growth series from 8 to 62 kg live weight, were dissected. Seventy individual muscles of these pigs were analysed for intramuscular fat content. The growth rates of each of the four fat depots, relative to total fat, were similar. Subcutaneous fat was the predominant fat depot over the growth range studied. Both intramuscular fat and non-fat dry matter grew faster than the entire muscles containing them. Growth gradients for the intramuscular fat of muscle groups, relative to either total intramuscular fat or to total fat, were similar to those for the entire muscles. The growth gradients for muscle groups were affected by neither the growth of the contained intramuscular fat nor the contained non-fat dry matter. Intramuscular fat density, but not non-fat dry-matter density, varied throughout the carcass. The fat content of muscles was highest in those that could be useful as subcutaneous insulators.

Breed and sex differences among equally mature sheep and goats 5. Lipid in dry tissue

1989 ◽  
Vol 49 (3) ◽  
pp. 411-422 ◽  
Author(s):  
C. S. Taylor ◽  
J. I. Murray ◽  
M. L. Thonney
Keyword(s):  
Dry Matter ◽  
Subcutaneous Fat ◽  
Live Weight ◽  
Lipid Concentration ◽  
High Lipid ◽  
Intermuscular Fat ◽  
High Concentrations ◽  
Highly Correlated ◽  
Feral Goat ◽  
Perirenal Fat

ABSTRACTMales and females from Soay, Welsh Mountain, Southdown, Finnish Landrace, Jacob, Wiltshire Horn and Oxford Down sheep breeds and a breed of feral goats were slaughtered when proportionately 0·40, 0·52 0·64 or 0·76 of mature live weight. Lipid concentrations in dried tissue were obtained for perirenal fat, omental plus mesenteric fat, subcutaneous fat, carcass muscle plus associated intermuscular fat, carcass bone and offal (pelt, head, feet and organs). Lipid varied from 260 g/kg dry matter (DM) for bone to 968 g/kg for perirenal fat.As animals matured, lipid concentration increased in the dry matter of all tissues except bone, most rapidly in offal and least in intra-abdominal fat. The increases were highly correlated with the associated increases in proportion of dissected fat.Breeds differed significantly in lipid concentration in the DM of all tissues examined. Breeds with a high lipid concentration in DM of one tissue usually had high concentrations in all other tissues. The Oxford Down had the highest concentration, and the Soay and feral goat the lowest. Males had slightly lower concentrations in all tissues except internal fat.As breed size increased, mean lipid concentration (at the same stage of maturity) also increased in the DM of all tissues except bone. These breed regressions were attributed to the sampling of breeds, the smallest breeds being the exceptionally lean Soay and feral goat. Among the domesticated breeds, there were no signficant trends with breed size.

Effects of selection for low backfat thickness in pigs on the sites of tissue deposition in the body

1983 ◽  
Vol 36 (3) ◽  
pp. 389-397 ◽  
Author(s):  
J. D. Wood ◽  
O. P. Whelehan ◽  
M. Ellis ◽  
W. C. Smith ◽  
R. Laird
Keyword(s):  
Selection Index ◽  
Subcutaneous Fat ◽  
Live Weight ◽  
Carcass Composition ◽  
The Body ◽  
Backfat Thickness ◽  
Selection For ◽  
The University ◽  
And Control ◽  
The Relationship

ABSTRACTThe effects of selection for low backfat thickness on tissue deposition in different body sites has been investigated in pigs. Eight castrated male and eight female pigs from each of the selection and control lines maintained at the University of Newcastle upon Tyne were used. One castrated male and one female from each line was killed at 15, 30, 45, 60, 75, 90, 105 and 120 kg live weight following ad libitum food consumption and fully dissected.There were only small effects of line on carcass composition, selected pigs having 120 g/kg more bone than controls at the mean side weight (P < 0·001) and 40 g/kg more lean (NS). At the same mean weight of subcutaneous fat, selected pigs had thinner backfat than controls (approximately 3 mm) over m. longissimus at the last rib and over the shoulder but not at the mid-rump or mid-back positions. There appears to have been a slight shift in the sites of fat deposition from above m. longissimus in the loin towards the mid-line and rump as a result of selection, even though mid-rump, C and K measurements were all included in the selection index. However, there was no difference between the lines in the weight distribution of subcutaneous fat between six regions and so these shifts must have been very localized. There was no difference between lines in the relationship between P2 fat thickness and proportion of lean in the side.The effects of selection on the sites of deposition within tissues other than subcutaneous fat were small. In particular there was no evidence that selection has caused relocation of body fat from subcutaneous to the other sites.

scholarly journals A Meta-Analytic Approach to Predict Methane Emissions from Dairy Goats Using Milk Fatty Acid Profile

2020 ◽  
Vol 12 (12) ◽  
pp. 4834
Author(s):  
Francisco Requena ◽  
Francisco Peña ◽  
Estrella Agüera ◽  
Andrés Martínez Marín
Keyword(s):  
Fatty Acid ◽  
Milk Fat ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Coefficient Of Determination ◽  
Dairy Goat ◽  
Milk Fatty Acid ◽  
Dairy Goats ◽  
Fat Composition ◽  
The Relationship

The aim of this work was to develop an equation to predict methane yield (CH4, g/kg dry matter intake) from dairy goats using milk fatty acid (FA) profile. Data from 12 research papers (30 treatments and 223 individual observations) were used in a meta-regression. Since most of the selected studies did not extensively report milk fat composition, palmitic acid (C16:0) was selected as a potential predictor. The obtained equation was: CH4 (g/kg dry matter intake) = 0.525 × C16:0 (% in milk fat). The coefficient of determination (R2 = 0.46), the root mean square error of prediction (RMSPE = 3.16 g/kg dry matter intake), and the concordance correlation coefficient (CCC = 0.65) indicated that the precision, accuracy and reproducibility of the model were moderate. The relationship between CH4 yield and C16:0 content in milk fat would be supported by the fact that diet characteristics that increase the amount of available hydrogen in the rumen for archaea to produce CH4, simultaneously favor the conditions for the synthesis of C16:0 in the mammary gland. The obtained equation might be useful, along with previous published equations based on diet characteristics, to evaluate the environmental impact of dairy goat farming.

The voluntary intake and utilization of roughage–concentrate diets by sheep. 2. Barley and soya bean meal supplementation of hay diets

1971 ◽  
Vol 13 (1) ◽  
pp. 83-92 ◽  
Author(s):  
J. R. Crabtree ◽  
G. L. Williams
Keyword(s):  
Dry Matter ◽  
Live Weight ◽  
Soya Bean ◽  
Metabolizable Energy ◽  
Ewe Lambs ◽  
Bean Meal ◽  
Voluntary Intake ◽  
Metabolizable Energy Intake ◽  
Soya Bean Meal ◽  
The Relationship

SUMMARYThree levels of soya bean meal (0%, 25% and 50% of the intake of hay dry matter) combined with three levels of pelleted barley (0%, 50% and 100% of the intake of hay dry matter) in a factorial arrangement of treatments were offered to Welsh Mountain ewe lambs receiving hay ad libitum for 14 weeks.When barley was not given, soya bean meal added at 25% of the hay intake increased hay voluntary intake from 287 g/day to 412 g/day but hay intake was depressed to 339 g/day by a further increase in the level of soya bean meal. When barley was given, soya bean meal did not affect hay intake. With one exception, an increase in barley reduced hay intake, with the result that there were no differences between treatments in the digestible energy intakes of lambs receiving barley at each level of soya bean meal. In general, it was found that an increase in the concentrate allowance (barley + soya bean) reduced hay intake, whereas an increase in the crude protein content of the concentrate increased hay intake. The relationship between live-weight change, metabolizable energy intake and live weight was examined by regression analysis. Although live weight and voluntary intake were unrelated at the start of the experiment, a positive relationship emerged as the experiment progressed.

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