The effect of selection for rapid lean growth on the dietary lysine and energy requirements of pigs fed to scale

McPhee, C.P.; Williams, Keith; Daniels, LJ

doi:10.1016/0301-6226(91)90095-8

Cited by 11 publications

(9 citation statements)

References 10 publications

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“…As Stern et al (1990); Bereskin et al (1990), Mc Phee et al (1991 proved, genetic correlations were, among other of the indicators of fattening efficiency and meat value, highly impacted by the composition and technique of feeding.…”

Section: Review Of Literaturementioning

confidence: 99%

The effect of feeding technologies on the economics of fattening pigs

Šprysl¹,

Stupka²

2003

AGR ECON-CZECH

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The aim of the experiment in test station was to evaluate productive performance with respect to feeding-technologies through the test for LWs × (LW×L) genotype in pigs. The productive performance as growth capacity, feeding intake and quantitative traits of slaughter value was examined for 144 hybrid pigs divided in two identical groups, where the 1 st group was fed ad-libitum and the 2 nd one semi-ad-libitum. On the base of profit formula, the ad-libitum system of feeding in pigs is better in all economic features. Key words: pig, feeding, performance, testing, economics, profit formula Abstrakt: Úèelem testu bylo zhodnocení dvou krmných technik na produkèní uitkovost hybridní kombinace prasat matka-otec (BU×L) × BO. Produkèní uitkovost 144 prasat (rozdìlených do dvou stejných skupin, kde první skupina byla krmena ad-libitnì a druhá skupina semiadlibitnì) byla hodnocena na podkladì rùstové intenzity, denního pøíjmu krmiva a kvantitativní stránky jateèné hodnoty. Na podkladì ziskové funkce bylo zjitìno, e ad-libitní technika krmení vykazuje ve vech ekonomických ukazatelích lepí výsledky, ne zpùsob krmení pomocí restringované krmné dávky.Klíèová slova: prase, krmení, uitkovost, testace, ekonomika, zisková funkce Experiments were realized in the frame of the research plan MSM 412 100 003.

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Section: Review Of Literaturementioning

confidence: 99%

The effect of feeding technologies on the economics of fattening pigs

Šprysl¹,

Stupka²

2003

AGR ECON-CZECH

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“…With minimization of environmental effects, they allow to determine the order of benefits of individual genotypes as well as maximum of production traits of the tested combinations of hybrids. This information is useful for breeders in the choice of the respective measures aimed at minimization of differences between the production traits of the given breeding and the production traits manifested by the selected genotype in the station test (Mc Phee et al 1991;Cameron 1991). With regard to economics, it is the case of the determination of the scope of the genotype x environment interaction that is well known in pig breeding (Merks 1989;De Hear 1990;De Hear, De Vries 1993;Šprysl, Stupka 1990Šprysl, Stupka , 1991Šprysl, Stupka , 1992.…”

Section: Review Of Literaturementioning

confidence: 99%

“…In order to ensure mutual comparability of internal factors influencing production traits, it is necessary to eliminate different environmental factors (Jakubec 1988;Cameron 1991;Mc Phee et al 1991).…”

Section: Review Of Literaturementioning

confidence: 99%

Genotype impact on the economy of production performance in pigs

Šprysl¹,

Stupka²,

Čítek³

2005

AGR ECON-CZECH

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Abstract:The test focussed on the evaluation of production traits, i.e. fattening performance and quantitative aspect of the carcass value in 4 genotypes of pigs by means of station tests. The tests included 288 hybrid pigs of the VEPIG and (LW d ×L) genotypes mated by hybrid-boars of (PN×D), (PN×H), (LW s ×BL). The outcomes have proved the existence of marked genotype differences in the production traits and, consequently, also in the economics which means for the pig breeders in the current period a significant measure conducing to the improvement of the economics of pig breeding. As the best, there has been proved the VEPIG genotype of pigs, which has shown the best results in all qualities of the fattening performance and carcass value. This genotype has also reflected best its highest growth intensity in the formation of meat which has been manifested positively in the classification of slaughter pigs, i.e. the profit per a slaughter pig in the amount of 625 CZK. In contrast, the other combinations have shown a loss which in the (LW d ×L) × (LW s ×BL) genotypes amounted to 324.50 CZK, in (LW d ×L) × (PN×D) 228 CZK and in (LW d ×L) × (PN×H) 279 CZK. Therefore it has to be stated that a deliberate selection of a suitable genotype is of a vital importance in order to be able to face the current considerably unfavourable situation in pig breeding.Key words: pig, genotype, production performance, testation, economy, profit formula Abstrakt: Účelem pokusu bylo zhodnocení produkční užitkovosti, tedy výkrmnosti a kvantitativní stránky jatečné hodnoty 4 genotypů prasat pomocí staničních testů. Testy se uskutečnily u 288 ks hybridních prasat genotypů VEPIG a (LW×L) zapuštěných kanci plemen (PN×D), (PN×H), (BO×BL). Dosažené výsledky prokázaly existenci výrazných genotypových diferencí v produkční užitkovosti a tedy i v ekonomice, což pro chovatele v současném období znamená významné opatření vedoucí ke zlepšení ekonomiky chovů prasat. Prokázalo se, že se jako nejlepší jeví genotyp prasat VEPIG, který ve všech vlastnostech výkrmnosti a jatečné hodnotě prokázal nejlepší výsledky. Tento genotyp svou nejvyšší růstovou intenzitu rovněž nejlépe promítl do tvorby masa, což se pozitivně projevilo v zatřídění jatečných prasat, resp. v zisku na jatečné prase ve výši 625 Kč. Ostatní kombinace naopak vykázaly ztrátu. Ta u genotypů (LW×L) × (BO×BL) činila 324,50 Kč, (LW×L) × (PN×D) 228 Kč a (LW×L) × (PN×H) 279 Kč. Je tedy nutné konstatovat, že uváženým výběrem vhodného genotypu lze s úspěchem čelit současné značně nepříznivé situaci v chovu prasat.

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“…The diets and ration fed to the trial pigs were fully described by McPhee et al (1991). Data from pigs given diets of varying lysine levels within a common energy level were combined so that the effect of nutrient density (low, medium and high) could be examined in the present study.…”

Section: Diets and Rationmentioning

confidence: 99%

Effects of genotype, diet and sex on backfat depth in pigs measured physically at different carcass sites and ultrasonically at different liveweights

McPhee¹,

Daniels²

1991

Aust. J. Exp. Agric.

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Pigs of both sexes, from a line selected for low backfat depth and an unselected line, were grown on 3 diets. Backfat depths were measured by ultrasonics at 3 liveweights during growth and by optical probe and scale at 5 sites on and off the midline of the carcass after slaughter. Ultrasonics and carcass measurements were equally effective at detecting the effects of line, diet and sex on fat depth. Average fat depth was higher in females than males, higher in the unselected line than in the selected line, and increased with dietary energy-lysine level. The difference between sexes, lines and diets increased with liveweight. Changing diets affected carcass fat depths at different sites of measurement uniformly, but both line and sex varied in their effects on fat depth at different sites.

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The effect of selection for rapid lean growth on the dietary lysine and energy requirements of pigs fed to scale

Cited by 11 publications

References 10 publications

The effect of feeding technologies on the economics of fattening pigs

The effect of feeding technologies on the economics of fattening pigs

Genotype impact on the economy of production performance in pigs

Effects of genotype, diet and sex on backfat depth in pigs measured physically at different carcass sites and ultrasonically at different liveweights

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