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The effect of mixed herb extract on selected stress parameters in broiler chickens of three genetic lines

100%

Skomorucha I., Sosnówka-Czajka E.

Annales Universitatis Paedagogicae Cracoviensis Studia Naturae

2018

The aim of the study was to determine the effect of adding a mixture of anti-stress herbs to drinking water on stress hormone levels and the heterophil to lymphocyte ratio in the blood of intensively reared broiler chickens of three genetic lines. The experiment was performed with ‘Ross 308’, ‘Cobb 500’ and ‘Hubbard Flex’ broiler chickens, which were divided into three experimental groups. Birds were maintained on litter for 42 days at a stocking density less than 33 kg/m2. All the groups were provided with the same environmental and feeding conditions. In each group from 21 to 35 days of rearing, water drinkers were supplemented for 5 h/day (08:00–13:00 hours) with an alcoholic extract from mixed herbs (30% chamomile, 10% oregano, 10% yarrow, 10% knotgrass, 10% valerian, 20% inflorescence of large-leaved lime) at 2 ml/l water. At 21, 28, 35 and 42 days of rearing, blood was collected from 10 birds per group to determine corticosterone, noradrenaline and adrenaline levels. The heterophil to lymphocyte ratio (H:L) was also calculated. On day 42 of the study, 500 broiler chickens were characterised by the lowest noradrenaline concentration and a lower H:L ratio compared to ‘Ross 308’ and ‘Hubbard Flex’ (p ≤ 0.05) and ‘Ross 308’ chickens (p ≤ 0.01), respectively. It was concluded from the study that the herb extract had the most favourable effect on relieving the body’s physiological response to stress, and thus on improving welfare in ‘Cobb 500’ compared to ‘Ross 308’ and ‘Hubbard Flex’ broilers. It can therefore be considered that active substances in herbs have varying effects on the body of broiler chickens of different origin.

Progress versus production costs of live broiler chickens in Poland between 1994 and 2015

67%

Utnik-Banaś K.

Zagadnienia Ekonomiki Rolnej

2017

issue 3(352)

60-73

The paper presents analysis of influence of total agriculture progress on changes of unit costs in broiler chicken production in 1994-2015. Results of annual assessment of utility value of broiler chicken in Poland were taken as a measure of total progress in production. This assessment was carried out by Central Animal Breeding Office (1994-2000), National Centre of Animal Breeding (2001-2003), and National Poultry Council (2004- -2015). All analysed indices improved between 1994 and 2015 as followes: feed conversion ratio from 2.52 to 1.66 kg/kg, daily mass increment from 38.1 to 60.0 g/day, mortality from 9% to 4.3%. In 1994-2015, unit costs of broiler production (expressed in constant prices of 1994) decreased by 36%. Up to 2003, decrease in costs was on average 2.5% yearly and since 2004 the decrease was on average 1% yearly. The strongest influence on lowering broiler chickens production costs (22%) was exercised by decrease in feed costs due to improvement of feed conversion ratio, decrease in other costs (9%) and the purchase amount of material for breeding and costs of purchase of one-day chicks (5%).

W pracy badano wpływ ogólnego postępu rolniczego na zmianę kosztów jednostkowych produkcji żywca brojlerów w latach 1994-2015. Za mierniki postępu przyjęto coroczne wyniki oceny wartości użytkowej kurcząt brojlerów w Polsce, prowadzonej przez Centralną Stację Hodowli Zwierząt (1994-2000), Krajowe Centrum Hodowli Zwierząt (2001-2003) oraz Krajową Radę Drobiarstwa (2004-2015). Wszystkie analizowane wskaźniki w okresie 1994-2015 uległy istotnej poprawie: wskaźnik zużycia paszy z poziomu 2,52 do 1,66 kg/kg, przyrost masy odpowiednio z 38,1 do 60,0 g/dobę, natomiast wielkość upadków zmalała z 9 do 4,3%. Jednostkowe koszty produkcji żywca, wyrażone w cenach stałych z 1994 roku, zmniejszyły się w latach 1995-2015 o 36%, przy czym do 2003 roku spadek kosztów następował w tempie 2,5% rocznie, natomiast od 2004 roku zmniejszenie kosztów zachodziło w średnim tempie 1% rocznie. Największy wpływ na obniżenie kosztów produkcji żywca brojlerów (o 22%) miał spadek kosztów pasz spowodowany poprawą wskaźnika konwersji paszy, obniżeniem (o 9%) kosztów pozostałych i kwoty zakupu materiału do chowu oraz kosztów zakupu piskląt jednodniowych (5%).

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1 Annales Universitatis Paedagogicae Cracoviensis Studia Naturae

1 Zagadnienia Ekonomiki Rolnej

1 Skomorucha I.

1 Sosnówka-Czajka E.

1 Utnik-Banaś K.

1 2018

1 2017

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The effect of mixed herb extract on selected stress parameters in broiler chickens of three genetic lines

Progress versus production costs of live broiler chickens in Poland between 1994 and 2015