Czech Journal of Animal Science, 2005 (vol. 50), issue 12

Influence of growth rate, backfat thickness and meatiness on reproduction efficiency in Landrace gilts

R. Bečková, P. Daněk, E. Václavková, M. Rozkot

Czech J. Anim. Sci., 2005, 50(12):535-544 | DOI: 10.17221/4259-CJAS  

In the nucleus herd and subsequent multiplication herd of the Landrace (L) breed in 262 gilts farrowed after the first insemination we analysed the influence of various levels of average daily weight gain from birth in the performance test in the field (ADG1) and till mating (ADG2), average backfat thickness (mm) in the performance test (BF1) and at mating (BF2) or lean meat percentage (LM1 and LM2) on the age and weight at mating and at farrowing, on the number of piglets born, piglets born alive and weaned ones and litter weight at 21 days. Based on the studied traits the gilts were divided into intervals for the evaluation according to the average...

Comparison of granddaughter design and general pedigree design analysis of QTL in dairy cattle: a simulation study

G. Freyer, N. Vukasinovic

Czech J. Anim. Sci., 2005, 50(12):545-552 | DOI: 10.17221/4260-CJAS  

Traditional methods for detection and mapping of quantitative trait loci (QTL) in dairy cattle populations are usually based on daughter design (DD) or granddaughter design (GDD). Although these designs are well established and usually successful in detecting QTL, they consider sire families independently of each other, thereby ignoring relationships among other animals in the population and consequently, reducing the power of QTL detection. In this study we compared a traditional GDD with a general pedigree design (GPD) and assessed the precision and power of both methods for detecting and locating QTL in a simulated complex pedigree. QTL analyses...

Effects of chemical preservative and pressing of ensiled sugar-beet pulp on the quality of fermentation process

P. Doležal, V. Pyrochta, J. Doležal

Czech J. Anim. Sci., 2005, 50(12):553-560 | DOI: 10.17221/4261-CJAS  

This study deals with effects of pressing of ensiled sugar-beet pulp and of application of a chemical preservative on the quality of fermentation process. The experimental silages had a better sensory evaluation than the control ones. In silages treated chemically with a mixture of acids, statistically significantly (P < 0.01) higher dry matter content, lowest pH value, the value of lactic acid and the lowest content of all acids in dry matter were found after 180 days of storage from the beginning of the experiment. The statistically significantly (P < 0.01) highest lactic acid content (43.39 ± 1.25 g/kg DM) was determined...

Effect of feed additives on the results of fattening and selected slaughter and quality traits of pork meat of pigs with different genotypes

A. Rekiel, J. Więcek, M. Dziuba

Czech J. Anim. Sci., 2005, 50(12):561-567 | DOI: 10.17221/4262-CJAS  

The effect of feed additives: antibiotic (group C), probiotic (group E1) and prebiotic (group E2) on the results of fattening and selected slaughter and pork meat quality traits of two genotypes of pigs (PLW × PL) × BL and (PLW × PL) × Dur, gilts and hogs, was determined. The results obtained for the examined traits in the feeding groups under comparison were slightly differentiated. The growth rate and feed conversion differed between the genetic groups in favour of crossbred fatteners with the proportion of Dur breed (P ≤ 0.01). The mean backfat thickness from 5 measurements and loin "eye" area in fatteners derived from Dur sires as compared...

Nutritional value of amaranth (genus Amaranthus L.) grain in diets for broiler chickens

B. Písaříková, Z. Zralý, S. Kráčmar, M. Trčková, I. Herzig

Czech J. Anim. Sci., 2005, 50(12):568-573 | DOI: 10.17221/4263-CJAS  

The following characteristics were determined in raw and popped amaranth grain: crude protein (158.1 and 168.5 g/kg), ether extract (71.5 and 69.4 g/kg), neutral detergent fibre (NDF) (99.2 and 111.8 g/kg), cellulose (86.6 and 60.0 g/kg) and essential amino acids (Cys 4.2 and 4.1, Thr 6.0 and 6.5, Ala 8.8 and 9.2, Val 6.8 and 7.4, Ile 5.2 and 5.6, Lys 9.2 and 8.8, Arg 12.8 and 14.2 g/kg). In vitro protein digestibility was 68.1 and 50.6% in raw and popped amaranth grain, respectively. In balance experiments with broiler chickens ROSS 308 the following coefficients of apparent digestibility (%) were determined for control and experimental diets...