The influence of feed protein level on some productive indices in Barred Plymouth Rock reared in free range system

The purpose of this paper was to assess the possibility of grow mixed breed broilers in free range system fed according to the slow feeding rate, with nutritional requirements mainly consisting of feed concentrate mixtures starting from the premises that currently there are no nutritional standards especially created for maintenance alternative systems. The experiment for the quantification of impact of nutritional features and of the CM administration intake on bio productive and economic performances of Barred Plymouth Rock avian youth has been reared during 10 weeks on two experimental variants. The elaborated experimental design was intended to assess the effect of a good nutritional start in both variants, but with a different time. Considering the same start, both in Vi and V2, by administering an CM with 2960 kcal ME and 22.04% CP, for 14 days in V| and 21 days in V2.Vi received a tri-phase feeding by using an intermediary „growing" phase during 36 days when CM was administered with 2990 kcal ME/kg and 20.03% CP followed by a finishing phase after 50 days and continued until the end of experiment, when CM was administered with 3000 kcal ME/kg and 17.30% CP. V2 was intended to establish the effect of a bi-phase feeding, therefore phase II became the „growing-finishing" phase, respectively the administration of a feed concentrate mixture with an energy level of 3000 kcal ME and 17.30% CP. Broilers in V,, tri-phase fed, had a feed intake comparison with that of broilers in V2 (bi-phase fed), an average body weight of 1428.60 g with a total increase of 8.3% higher and a better feed conversion (2.66 kg/kg) considering the increased costs per kg of live mass with 1.87% comparing with V2. Regarding the CP intake, depending on ME intake, the registered values are close in both variants. Based on a mathematic model like: y = a/(l+bx+cx2 ), one can assess the fodder feeding costs. The correlation rate between the fodder feeding costs and the CP intake is strongly positive for both variants

The influence of feed protein level on some productive indices in Barred Plymouth Rock reared in free range system

The purpose of this paper was to assess the possibility of grow mixed breed broilers in free range system fed according to the slow feeding rate, with nutritional requirements mainly consisting of feed concentrate mixtures starting from the premises that currently there are no nutritional standards especially created for maintenance alternative systems. The experiment for the quantification of impact of nutritional features and of the CM administration intake on bio productive and economic performances of Barred Plymouth Rock avian youth has been reared during 10 weeks on two experimental variants. The elaborated experimental design was intended to assess the effect of a good nutritional start in both variants, but with a different time. Considering the same start, both in Vi and V2, by administering an CM with 2960 kcal ME and 22.04% CP, for 14 days in V| and 21 days in V2.Vi received a tri-phase feeding by using an intermediary „growing" phase during 36 days when CM was administered with 2990 kcal ME/kg and 20.03% CP followed by a finishing phase after 50 days and continued until the end of experiment, when CM was administered with 3000 kcal ME/kg and 17.30% CP. V2 was intended to establish the effect of a bi-phase feeding, therefore phase II became the „growing-finishing" phase, respectively the administration of a feed concentrate mixture with an energy level of 3000 kcal ME and 17.30% CP. Broilers in V,, tri-phase fed, had a feed intake comparison with that of broilers in V2 (bi-phase fed), an average body weight of 1428.60 g with a total increase of 8.3% higher and a better feed conversion (2.66 kg/kg) considering the increased costs per kg of live mass with 1.87% comparing with V2. Regarding the CP intake, depending on ME intake, the registered values are close in both variants. Based on a mathematic model like: y = a/(l+bx+cx2 ), one can assess the fodder feeding costs. The correlation rate between the fodder feeding costs and the CP intake is strongly positive for both variants

A bio-economic analysis model in Tetra H hybrid raised in organic system

This paper shows a bio-economic analysis model in Tetra H hybrid, raised in organic system, in line with the protein intake and of the body weight registered during the experimental period. The mathematic model y=a/(l+bx+cx2) allows the assessment of the expenses recorded with chicken feeding depending on crude protein intake. The model also validates the possibility to simplify the chickens' nutrition technology (starting from a triphase fodder feeding to a diphase fodder feeding) and at nutritional (protein) levels adapted to the desired body weight. The indices of correlation between the expenses registered with fodder feeding and crude protein intake show us that between them there is a strongly positive correlation, thus: 0.958 (in Tl), 0.980 (in T2) and 0.972 (in T3). The indices of determination (R2) corresponding to the three experimental variants are higher, with values over 0.963, and the error percentage of the mathematical model is reduced (below 6%). Based on the results obtained in Tetra H chickens, it may be recommended a diphase fodder feeding (with starter fodder between 1-21 days and grower-finisher fodder between 22-112 days) with concentrates mixtures (CM) by 22% and 17,5% CP and 2971 and 3160 kcal ME/kg

A bio-economic analysis model in Tetra H hybrid raised in organic system

This paper shows a bio-economic analysis model in Tetra H hybrid, raised in organic system, in line with the protein intake and of the body weight registered during the experimental period. The mathematic model y=a/(l+bx+cx2) allows the assessment of the expenses recorded with chicken feeding depending on crude protein intake. The model also validates the possibility to simplify the chickens' nutrition technology (starting from a triphase fodder feeding to a diphase fodder feeding) and at nutritional (protein) levels adapted to the desired body weight. The indices of correlation between the expenses registered with fodder feeding and crude protein intake show us that between them there is a strongly positive correlation, thus: 0.958 (in Tl), 0.980 (in T2) and 0.972 (in T3). The indices of determination (R2) corresponding to the three experimental variants are higher, with values over 0.963, and the error percentage of the mathematical model is reduced (below 6%). Based on the results obtained in Tetra H chickens, it may be recommended a diphase fodder feeding (with starter fodder between 1-21 days and grower-finisher fodder between 22-112 days) with concentrates mixtures (CM) by 22% and 17,5% CP and 2971 and 3160 kcal ME/kg

Bio-economic impact of energy and protein level in feed for laying hens raised in organic system

The economic results of organic egg production are largely dependent on the cost of the feed and productive performance. The paper aims to establish the productive performance of laying hens raised under specific conditions specific for the ecological system, and also performing a feeding costs estimation based on mathematical models starting from experimental data required. The hens in the experiment were fed a mixture of concentrated (MC) with 2728 kcal metabolizable energy (ME), 15.85% crude protein (CP), 0.67% lysine, 0.52% methionine + cystine, containing in its structure only fodder types organically certified. Throughout the entire experimental period, chickens have recorded a total MC consumption of 13.240 kg with an average daily consumption between 0.110 and 0.130 kg, when they produced a daily average of 31.55 g mass-egg. The amount of mass-egg produced (y) under this experiment can be predicted based on metabolizable energy intake (x1) and crude protein (x2) using the following mathematical model y=a+b*x1+c*x12+d*x13+e*x14+f*x15+g*x2 (R2=0.99%). Between the values obtained after the experiment and the predicted values obtained using the mathematical relationship, the differences are very small 2.17% at the end of experimental period. The costs incurred by feeding the laying hens (y) organically raised can be predicted using the following mathematical model y=exp(a*x1+b*x2+c*x3+d) (R2=0,96), with a rate of error of less than 2.2%, depending on the amount of mass-egg produced (x1), metabolizable energy intake (x1) and crude protein intake (x2)