scholarly journals Simplified dissection as an aid in carcass evaluation on the landrace and Yorkshire breeds

1972 ◽  
Vol 44 (1) ◽  
pp. 1-11
Author(s):  
Unto Uusisalmi
Keyword(s):  
Least Squares ◽  
Multiple Regression ◽  
Stepwise Multiple Regression ◽  
Carcass Quality ◽  
Progeny Testing ◽  
Slaughter Weight ◽  
Kidney Fat ◽  
Better Than

Information on carcass quality obtained from dissection and conventional carcass evaluation was studied on the Landrace and Yorkshire breeds. Progeny testing pigs (n = 196) were slaughtered at a weight of c. 90 kg. After conventional carcass evaluation, the carcass half was dissected. The objects of study were the most valuable parts of the half carcass (= ham + carré + back + fore back + shoulder + kidney fat) and its skin+fat and meat+bone components. The possibility of restricting the dissection to the ham and the back was also examined. By means of the least squares methods the following results were obtained: The effect of the slaughter weight on the skin+fat, the meat+bone and the valuable part was very significant. The variation due to age was not significant. The carcass quality on the gilts was better than that of the castrates. By stepwise multiple regression procedures estimations were derived for the skin+fat component, the meat+bone component and the most valuable part of the carcass. By dissection of the ham and the back more information was generally obtained about the slaughter quality of the most valuable part than was obtained by the conventional carcass evaluation. The index (= A/B x A/C x10) was calculated, in which A = weight of the meat+bone component, B = age in days and C = weight of the half carcass. The index correlated with the skin+fat component and its percentage as follows: r = —0.34**– –0.55***, and with the meat+bone component and its percentage: r = 0.77*** —0.78***. Possibilities of developing the index were examined.

scholarly journals The conventional carcass evaluation and the carcass dissection analysis of pigs

1971 ◽  
Vol 43 (1) ◽  
pp. 40-52
Author(s):  
Unto Uusisalmi
Keyword(s):  
Regression Analysis ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Stepwise Multiple Regression ◽  
Carcass Quality ◽  
Progeny Testing ◽  
Stepwise Multiple Regression Analysis ◽  
Explanatory Variables ◽  
Left Half ◽  
Kidney Fat

The information provided by conventional carcass evaluation concerning the carcass quality established by analyses of dissection was investigated on progeny testing pigs (n = 153). After conventional carcass evaluation, the left half of the carcass was cut up. In the most valuable part of the half carcass (ham + carré + back + fore back + shoulder + kidney fat) the skin + fat component was separated from the meat + bone component. The material was processed by stepwise multiple regression analysis. It was possible by means of the results of conventional carcass evaluation to explain 69 % of the variation in the weight of the skin + fat component and 64 % of the variation in its percentage, 61 % of the variation in the weight of the meat + bone component and 56 % of the variation in its percentage, 59 % of the variation in the weight of the most valuable part of the carcass and 17 % of the variation in its percentage. The estimations calculated for the skin + fat component and its percentage had the same characteristics in conventional carcass evaluation as explanatory variables. The estimations calculated for the meat + bone component and its percentages differed from each other. The estimations calculated for the most valuable part of the carcass and its components also explained the shoulder, back and ham, as follows: a) the shoulder, most weakly, b) the skin + fat of the back, best by the skin + fat estimations (56 % of the variation), c) the meat + bone of the ham, best by the meat + bone estimations (58 % of the variation). The length of the carcass and of the side did not occur in the estimations.

scholarly journals Evaluation of carcass quality of live pigs at weights of 60 kg and 90 kg

1971 ◽  
Vol 43 (2) ◽  
pp. 111-127
Author(s):  
Unto Uusisalmi
Keyword(s):  
Regression Analysis ◽  
Least Squares Method ◽  
Live Weight ◽  
Stepwise Multiple Regression ◽  
Carcass Quality ◽  
Progeny Testing ◽  
Stepwise Multiple Regression Analysis ◽  
Explanatory Variables ◽  
Initial Correlation

The possibility of predicting the carcass quality from live pigs at weights of c. 60 kg and c. 90 kg was investigated on progeny testing pigs (n = 236) of Landrace and Yorkshire breeds. In both weight classes the thickness of the fat was measured with an ultrasonic instrument on the back, hams and shoulders, as well as the depth of the m. long, dorsi. Exterior measurements and points evalutations were also made. The pigs were slaughtered at a weight of 90 kg, after which a conventional carcass evaluation was made. The least squares method (HARVEY 1966) was used to analyse the results in order to establish the effect of the live weight, the group, breed and sex. After calculating an initial correlation matric (179 x 179), 20 characteristics obtained from the carcass evaluation were taken as functions, and 30 characteristics of both the live weights taken as optional explanatory variables, for further processing by stepwise multiple regression analysis. The back fat can be estimated from measurements at live weights of 60 kg (R2 = 0.53) and 90 kg (R2 = 0.75). The fat estimations obtained from the two weight classes showed similarities. The average back fat measured at a live weight of 90 kg correlated significantly with the average back fat measured from the carcass (r = 0.82***, r2 = 0.67), and the side fat at a live weight of 90 kg with the s.o.l. from the carcass (r = 0.79***, r2 = 0.62). Prediction of the area of the m. long. dorsi was poor in both the weights (R2 = 0.27—0.29).

scholarly journals Ham quality and its relationship to carcass quality I. Ultrasonic and other measurements

1971 ◽  
Vol 43 (3) ◽  
pp. 129-139
Author(s):  
Unto Uusisalmi
Keyword(s):  
Specific Weight ◽  
Stepwise Multiple Regression ◽  
Carcass Quality ◽  
Sufficient Information ◽  
Stepwise Multiple Regression Analysis ◽  
Slaughter Weight ◽  
Research Material ◽  
Ultrasonic Measurements ◽  
Yorkshire Pigs

Ham quality and its relationship to carcass quality were studied in Landrace and Yorkshire pigs at the Puistola testing station. The research material was as follows: 1) ultrasonic and other measurements and points evaluation of 236 live pigs in three weight classes, and conventional carcass evaluation of these pigs; 2) ultrasonic and other measurements and points evaluation of 97 live pigs, determinations of the specific weight of the ham, and the dissection results on the left half of the carcass. The subjective points evaluation of ham performed on the live pigs did not correlate with the subjective points evaluation made on the carcasses. Nor did the exterior measurements made on the ham provide sufficient information about the slaughter quality of the ham. By means of stepwise multiple regression analysis, estimations were obtained for the skin + fat and meat + bone components of the most valuable part of the carcass and of the ham. In these estimations the most important were the dissection results and specific weight of the ham and the ultrasonic measurements. The statistically significant effect of the slaughter weight emerged to such an extent that corrections according to slaughter weight were found necessary in the dissection analysis.

scholarly journals Incidencia de las características personales e inherentes al empleo sobre la satisfacción de los trabajadores en España

2020 ◽  
Vol 32 (1) ◽  
pp. 311
Author(s):  
María Carmen Sánchez Sellero ◽  
Pedro Sánchez Sellero
Keyword(s):  
Labour Market ◽  
Multiple Regression ◽  
Linear Models ◽  
Stepwise Multiple Regression ◽  
Deep Recession

This paper tries to determine the main features of the labour satisfaction. We applied the mentioned analysis to the current Spanish labour market, which is affected by a deep recession and instability. We want to get differences between personal and job-related features in order to find which better explain the labour satisfaction. Data come from the Quality of Labour Life Survey corresponding to the year 2010 by Ministry of Labour and Immigration of Spain. By means of linear models (ANOVA) we find that job-related variables explain better labour satisfaction, also, all the coefficients are positive. Finally, we propose a stepwise multiple regression which let us to put in order the effect of job-related variables on labour satisfaction. The variable with higher influence on labour satisfaction is motivation.

scholarly journals Identification of a synchronous generator parameters using recursive least squares and Kalman filter

2021 ◽  
Vol 12 (1) ◽  
pp. 13-21
Author(s):  
Diego Alberto Bravo Montenegro ◽  
Carlos Felipe Rengifo ◽  
Cristian Giron ◽  
Jhon Palechor
Keyword(s):  
Kalman Filter ◽  
Least Squares ◽  
Synchronous Generator ◽  
Measured Data ◽  
Operating Conditions ◽  
Recursive Least Squares ◽  
Phase Voltage ◽  
Three Phase ◽  
Better Than

The comparison between recursive least squares (RLS) and Kalman filter (KF) is presented in this paper, both methods were adequate to estimate six parameters of a synchronous machine. The work focused on finding the operating conditions which the quality of the identification achieved with Kalman filter is better than recursive least squares. A linear model of the machine is used in order to considerate the currents and their derivatives as the system inputs while the three-phase voltage signals are the outputs. Furthermore two experiments with simulated and measured data were carried out, three operating scenarios and two variations of the algorithms respectively were considered. Despite the great similarity and good performance of both methods, it was found that Kalman filter slightly exceeded least squares due to the fact that it presented smaller oscillations in the estimated value of the parameters for any operating condition.

scholarly journals Effects of Increasing Slaughter Weight on Production Efficiency and Carcass Quality of Finishing Gilts and Barrows

2010 ◽  
Vol 30 (2) ◽  
pp. 206-215 ◽  
Author(s):  
Jin-Yeun Jeong ◽  
Byung-Chul Park ◽  
Duck-Min Ha ◽  
Man-Jong Park ◽  
Seon-Tea Joo ◽  
...  
Keyword(s):  
Production Efficiency ◽  
Carcass Quality ◽  
Slaughter Weight

scholarly journals Effect of genotype, sex and litter size on growth and basic traits of carcass quality of light lambs

2011 ◽  
Vol 59 (3) ◽  
pp. 111-116 ◽  
Author(s):  
Jan Kuchtík ◽  
Igor Dobeš ◽  
Zdeňka Hegedűšová
Keyword(s):  
Litter Size ◽  
Carcass Quality ◽  
Free Access ◽  
Daily Feeding ◽  
Organic Mineral ◽  
Kidney Fat ◽  
Ad Libitum ◽  
Dressing Percentage ◽  
Mineral Lick

Evaluation of the effect of genotype (Romanov breed: n = 26, and F1 crossbreds of Suffolk-Romanov: n = 29), sex (males: n = 37 and females: n = 18) and litter size (singles: n = 6, twins: n = 16, triples: n = 21 and quadruplets: n = 12) on growth and basic carcass quality traits of light lambs was carried out at an organic sheep farm in Kuklík over the years 2007 and 2008. Throughout the experiment the lambs were reared with their mothers, indoors. The weaning of lambs was carried out just before slaughter. The daily feeding ration of the lambs consisted of the mother’s milk (ad libitum) and organic mineral lick (ad libitum), whereas the lambs had free access to the feedstuff of their mothers.The daily feeding ration of the ewes consisted of haylage (2.5 kg/ewe), meadow hay (ad libitum) and organic mineral lick (ad libitum). The genotype (G) and the sex (S) had not a significant effect on growth of lambs in the period from birth till the slaughter. On the other hand the litter size (LS) had a highly significant effect on this trait, whilst the highest daily gain in above-mentioned period was found in singles (157 g). Concerning the carcass traits the G had a significant effect only on carcass dressing percentage while the S had a significant effect only on proportion of kidney. Nevertheless the LS had a significant effect on carcass dressing percentage and the proportions of skin, kidney and kidney fat. In conclusion it can be completed that the fatness scores of all individual carcasses were relatively very low which is important for good realisation of the carcasses on the market.

Comparison of three practical rations for growing pigs

1965 ◽  
Vol 64 (1) ◽  
pp. 87-91 ◽  
Author(s):  
R. Braude ◽  
Marilyn R. Lyon ◽  
J. G. Rowell
Keyword(s):  
Growth Rate ◽  
Growing Pigs ◽  
Carcass Quality ◽  
Progeny Testing ◽  
Food Conversion ◽  
Fattening Pigs

A co-ordinated trial has been carried out at twenty-six centres to compare the effects of three practical rations on performance and carcass quality of fattening pigs. The simplest of these was the ‘Shinfield ration’ (SR) and this was compared with the more elaborate National Pig Progeny Testing Station rations, the ‘old’ ration (OPT) as used until January 1963 and the ‘new’ ration (NPT) as used since January 1963.The OPT ration was significantly worse than the SR and NPT rations in respect of growth rate and food conversion. The simpler and cheaper SR ration did not differ significantly from the NPT ration. Ration differences were not significant for any carcass measurements.

scholarly journals Basic chemical composition of meat and carcass quality of fattening hybrids with different slaughter weight

2015 ◽  
Vol 69 (2) ◽  
pp. 121-126 ◽  
Author(s):  
Dragomir Lukac ◽  
Vitomir Vidovic ◽  
Aleksandar Stoisavljevic ◽  
Nikola Puvaca ◽  
Natalija Dzinic ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Live Weight ◽  
Intramuscular Fat ◽  
Carcass Quality ◽  
Slaughter Weight ◽  
Ph Values ◽  
Mineral Substances ◽  
Mineral Substance ◽  
Fattening Pigs

Meat is a very rich and universal source of nutrients. The primary importance of meat is based especially on protein content. Optimum slaughter weight has influence on the basic chemical composition of meat. Fattening pigs were classified by their weight into three groups before the slaughter day. The highest content of proteins and water was found in the part of ham and shoulder in the group of animals at 100-110 and 111-120 kg of live weight, respectively, while the lowest content was found in the part of neck in animals at 121-130 kg of live weight. The highest content of intramuscular fat and mineral substances was in animals at 121-130 kg (neck and loin), while the lowest content was in animals at 100-110 kg live weight (ham). The pH values were within the optimum limits (5.33 - 5.77). Differences between the groups for the values of proteins content, mineral substance and pH values were statistically highly significant (p<0.05; p<0.01), while for the contents of water and intramuscular fat there were no differences (p>0.05) between the groups.

Using Suffolk sheep for improving lamb production from sub-tropical Egyptian sheep:2. Lamb and fattening performance

1978 ◽  
Vol 90 (1) ◽  
pp. 131-137 ◽  
Author(s):  
A. S. El-Shobokshy ◽  
A. M. Aboul-Naga
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Birth Weight ◽  
Live Weight ◽  
Carcass Quality ◽  
Live Weight Gain ◽  
Fattening Performance ◽  
Body Weights ◽  
Better Than

SUMMARYLamb and fattening performance and carcass quality of Suffolk x local Ossimi cross-bred lambs are discussed. 1369 cross-bred lamb records over the period from 1957 to 1970 were available for the study. The lambs of 50–59% Suffolk were the best cross-bred group with an advantage of 7–7, 14–2 and 17–1% over the native Ossimi lambs in birth weight, 120-day and yearling body weights, respectively. Generally, lamb performance declined as the Suffolk breeding was increased. However, breed groups variation was not statistically significant, except for birth weight.Seventy-one weaned male lambs, 4 months of age, from three breed groups: 70–90% Suffolk, 35–45% Suffolk and local Ossimi, were fattened for 16 weeks using two levels of feeding. The two Suffolk cross-bred groups gained slightly more body weight than the local Ossimi. After 8 weeks of fattening, the 35–45% Suffolk lambs gained significantly more weight than the local lambs. However, the local lambs were more efficient in converting food to live-weight gain.The carcass quality of the Suffolk cross-bred lambs was better than the local lambs, and the advantage was greater for the high Suffolk breeding group.

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