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The aim of this research was to investigate the addition of Calcium source (marble powder) of up to 1.2, 1.4, 1.6% levels on growth performance, feed intake, some organ weights and tibia ash parameters in broiler diets. This research was conducted according to Randomized Plots Design by using 3 groups with 3 replicates between 12 May - 23 June in Çarýklý region of Diyarbakýr. The experiment was conducted on 126 day-old equally sexed Ross 308 broiler chicks. Three diets used as 3 treatments were included (1.2, 1.4 and 1.6% Ca levels) in broiler the diets. Three replicates with 14 equally sexed birds were arranged in each plot. The experiment was started from 7-days-of-age to slaughter weight. The first group was a control and contained 1.2% Ca levels; marble flour was added to the control diet as a Ca source and the Ca levels 1.4 and 1.6% for the 2nd and 3rd groups, respectively. At the end of the trial, data were analysed by MSTAT C program, and means were examined by DUNCANs multiple test. There were no statistically significant differences between the groups for all investigated parameters (Live weight gain, feed intake, feed conversion ratio, carcass parameters and some organ weights) using Ca doses (P > 0.05). However, crude ash and calcium contents of diets were increased by additional Ca levels (P < 0.01), but phosphorus content of diets were decreased by the addition of a calcium source. The results of this study have shown that there is no adverse effect on broiler performance of an additional Ca source up to 1.6% levels.
The association was studied between the polymorphism at leptin (LEP), Pit1, and STAT5A loci and meat production traits in 145 Black-and-White growing/fattening bulls. Genotypes of LEP, Pit1 and STAT5A were determined with the PCR-RFLP technique. Over the 8th month of age the 28-day performance test was introduced to assess growth rate and feed conversion during which the fullconcentrate diet was offered ad libitum. At the age of 15 months the bulls were slaughtered, and their carcasses cut and dissected into lean, fat and bone.The allele frequencies were 0.85, 0.07, and 0.08 for A, B and C LEP variants, 0.25 and 0.75 for A and B Pit1 variants, and 0.90 and 0.10 for C and T STAT5A variants, respectively. Polymorphism of lepton significantly affected some carcass traits, and among them the weight of carcass-side that was highest in the AA homozygotes. The effect of Pit1 genotype was observed on carcass dimensions only. The AA homozygotes had higher chest circumference, chest depth, and circumference of round, but BB homozygotes had a higher round width. CT genotype of the STAT5A-encoding gene significantly affected four out of 36 carcass traits measured and was related to higher weight of bone of best + fore ribs (4.2 vs 3.8 kg) and of sirloin (1.6 vs 1.3 kg) as well as to oblique carcass length (140.5 vs 138.5 cm). The CC STAT5A genotype was associated with significantly higher live weight gain from 8 to 15 months (1.04 vs 0,97 kg daily).
Wyprodukowano 5 mieszanek pełnoporcjowych typu PT-2 z udziałem 0, 20, 40, 60 i 90% śruty pszenżytniej. Mieszanki te stosowano od 90. dnia życia do osiągnięcia średniej masy ciała ok. 116.50 kg. Najlepsze wyniki produkcyjne uzyskały tuczniki z grupy V, żywione mieszanką z udziałem 90% śruty pszenżytniej. Wartości współczynników strawności włókna surowego, białka ogólnego i bezazotowych wyciągowych tej mieszanki były najwyższe. Retencja azotu była wprawdzie wysoka, ale najkorzystniejsza u prosiąt żywionych mieszanką 1 - kontrolną - z udziałem 90% śruty jęczmiennej. Uzyskane wyniki upoważniają do stwierdzenia, że w żywieniu tuczników mogą być stosowane mieszanki z udziałem do 90% śruty pszenżytniej.
Research was carried out in two standard pigsties, in the Olsztyn province. Microclimatic conditions, warmth retention of the buildings and obtained production results (weight gains of porkers and conversion of oat units and digestible crude protein per 1 kg of weight gain ) were compared. Obtained results showed that both pigsties met the requirements concerning buildings designed for pig fattening, and that production results were much above the average.
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