AbstrAct:The objectives of the paper were to evaluate carcass value in reared gilts on the basis of carcass analysis during the station test of purebred progeny of pigs and ultrasonically with SoNoMARK-100 or PIGloG-105 instruments in the framework of valid methodology for performance testing, and to verify a possibility of prediction of backfat thickness and/or average daily weight gain since birth and lean meat content of gilts as the elements of objectification for the evaluation of their body condition. In total 54 gilts of two breeds were evaluated: the dam breed Czech large White and the sire breed Czech large White -sire line. Four-parameter Richards function was used for growth evaluation. The regression function y = 63.870 -0.447 bt 1 -0.510 bt 2 + 0.128 MllT was applied in ultrasonic instruments for the calculation of lean meat content. We calculated linear regression functions for the conversion of performance testing parameters (gain from birth, average backfat thickness and lean meat content) from live weight on the day of measurement per live weight declared during selections in gilts.Keywords: gilt; growth; carcass value; backfat thickness; lean meat content; body condition 254Original Paper Czech J. Anim. Sci., 51, 2006 (6): 253-261 connected with early mating, and after conception with the lower number of piglets born in parity 1 and/or with a prolonged time until the onset of further practically utilisable oestrus that may be twice longer than in older sows. For these reasons producers may often be convinced that the gilt designed for replacement of the basic herd of sows is a risky factor. Besides nutrition, health and animal welfare the early mating of gilts, early weaning of piglets and optimum farrowing interval are the main production and economic efficiency factors in the piglet industry (Říha et al., 2001). According to Schneeberger (2005) especially in young gilts in farrowing pens weight losses and negative changes in their body condition occur. He explains it by lower than required daily feed intake. He proves that in operating conditions nursing sows take in only 6 kg of feed on average instead of the required 7 kg. The lower intake of total mixed ration results in the loss of about 10 kg of live weight and 1.5 mm of backfat thickness during piglet sucking. Consequently, the sows have irregular or delayed oestrus, and the value of ovulation or implantation is also influenced negatively. These problems are typical of young gilts whose bodily growth has not been completed yet.Recent knowledge of the relations between reproductive disorders and carcass composition of gilts (sows) indicates that the reduction of so called fat depot achieved by breeding may explain this problem only partially. However, the absolute or dynamic level of the lean meat content may be at the same time a critical parameter for the normal course of reproductive functions in gilts and sows (Říha et al., 2001).Similar problems were solved in the papers of Kuhlers and Jungst (1993), Kerr and Cameron (1994), Klau...
A study was conducted in a set of hybrid gilts of F1 generation of Czech Large White x Czech Landrace breeds coming from a multiplication herd. The objective of the study was to test a possibility of using the measured traits, i.e. backfat thickness (BT) and lean meat content (LM), for objective determination of changes in the body condition score of gilts during rearing and in relation to their subsequent fertility in parities 1. At the ultrasonic measurement in the multiplication herd the purchased gilts showed the average daily gain (ADG) from birth 612.5 g, average backfat thickness (ABT) 8.34 mm, loin muscle depth (LMD) 48.83 mm and LM 62.26%. At the first determination of own performance traits in a production herd the values of ABT, LMD and LM were 13.26 mm, D 59.29 mm and 58.83%, respectively. In a subsequent measurement (at the onset of standing heat) the respective values of ABT, LMD and LM were 15.15 mm, 62.31 mm and 57.42%. Correlation coefficients for the measured traits of own performance in relation to reproductive traits in parities 1 were mostly low, statistically insignificant.
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