Grażyna Michalska, Jerzy Nowachowicz, Tomasz Bucek, Przemysław Dariusz Wasilewski, Małgorzata Kmiecik
Abstract. The aim of presented paper was to analyse the results of performance test of crossbred gilts of Polish Large White and Polish Landrace breed conducted in years 2009–2013 in the Bydgoszcz Breeding Region. They came from two crossing variants (sows breed at first position): [PLW × PL] and [PL × PLW]. Crossbred gilts [PL × PLW] in all analysed years (except for 2001) had higher daily gain of body weight standardised on 180th day than [PLW × PL] animals. From 2009 till 2013 the growth rate of tested crossbred gilts, i.e. [PLW × PL] and [PL × PLW] increased by 10 and 8 g, respectively. Within the space of 5 tested years (2009–2013) an improvement of breeding value of animals determined as selection index value, which increased by 7 points in [PLW × PL] gilts and by 4 points in [PL × PLW] pigs. This proves the effective improvement of growth and slaughter performance of crossbred gilts came from The Bydgoszcz Breeding Region within the space of years 2009–2013, being maternal component used in breeding and commercial crossing, which should be monitored in following years.
Anna Konieczka, Anna Nienartowicz-Zdrojewska, Janusz Buczyński, Zbigniew Sobek, Jolanta Różańska-Zawieja
Abstract. Experimental material comprised 47 Złotnicka Spotted sows, coming from 2 piggeries keeping Złotnicka pigs within conservative breeding. Slaughter performance was evaluated on carcasses coming from their offspring (112 carcasses – Złotnicka Spotted x Duroc) and 16 carcasses coming from purebred animals. The following reproduction performance traits of sows were investigated: the number of piglets born in the litter and the number of piglets reared 21st day, and the following slaughter performance traits of their offspring were analyzed: weight of caracass (kg), mean backfat thickness (mm), height of loin eye of the longissimus dorsi muscle (mm) and meat percentage in the carcass (%). The most numerous litters, both at day 1 (10.16 head) and on 21st day of life (9.99 head), were those sired by Duroc boars. Recorded differences turned out to be statistically high significant. The breed of the sire also had a significantly high effect on meatiness of fatteners.
Abstract. Increasing zinc and copper concentration in diet is accompanied with increasing of their content in common carp (Cyprinus carpio L.) tissues, namely in skeletal muscles. Correspondingly, concentration of anionic forms of fatty acids in the skeletal muscles is also increasing. Total content of non-esterified fatty acids tends to increase in the skeletal muscles of carp at copper and zinc concentration in mixed fodder 8 and 100 mg/kg respectively, while at 16 and 200 mg/kg of copper and zinc respectively, it is decreasing. Increasing of copper and zinc concentration in the diet of carps is accompanied by increasing of level of fatty acids of total lipids in their skeletal muscles. Simultaneously, in total lipids of the skeletal muscles of carp, ratio of polyunsaturated fatty acids of ω-3 family to ω-6 family is increasing. Wherein in total lipids of the skeletal muscles of carp, efficiency of linolic and linolenic acids transformation to their more long-chain and more unsaturated derivatives is growing; concurrently intensity of transformation of myristinic, palmitinic, stearinic and arachinic acids of total lipids to their corresponding monounsaturated derivatives is increasing. During the period of investigations, carp of trial groups had higher wieght gains in comparison to carp of control group.