Influence of soybean meal replacement with high-protein sunflower meal on “Clarcs of energy distribution/protein transformation” in broiler chickens

S. Chobanova1, D. Penkov2*

1Department of Morphology, Physiology and Nutrition, Section Animal Nutrition, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
2Department of Animal Sciences, Faculty of Agronomy, Agricultural University, 12 D. Mendeleev Str., 4000 Plovdiv, Bulgaria

(Manuscript received 28 May 2021; accepted for publication 30 June 2021)

Abstract. The aim of the study is to compare the net utilization of energy and protein in the eco-technical chain „feed-meat“ when replacing part of the soybean meal with high-protein sunflower meal in broiler fattening. One control and 3 experimental groups, 4-phases fattening with isoenergetic and isoprotein combined fodders. Main protein source in the fodders for the control group is soybean meal. Replacement with sunflower meal: First experimental group: Starter – 5%, Grower – 8%, Finisher 1 – 10% and Finisher 2 – 10%; Second experimental group: 15, 18, 25 and 25%, respectively; Third experimental group: 34.25, 27.27, 27.27 and 26%, respectively. Clarcs of energy distribution/protein transformation (CED/CPT) are the ratio between accumulated gross energy/crude protein in breast and thigh muscles and consumed metabolic energy/crude protein throughout life. The following results were established: CED “fodder – breast+thigh muscles”: Control – 0.2430, first experimental group – 0.2394, second experimental group – 0.2505, third experimental group – 0.2334; CPT – 0.6080, 0.5050, 0.5280 and 0.5490, respectively.

In vivo digestibility of cereal-based diets supplemented with sunflower vs. rapeseed meal

M. Yossifov, L. Kozelov
Abstract. Two experiments were conducted to investigate effects of rapeseed meal (RSM) vs. sunflower meal (SFM) as a protein source at cereal-based isonitrigenous (at 16 % CP), iso-caloric at gross energy 18 kcal/kg and net (FUG=1) energy diets for fattening lambs. Four wethers (Gygay breed) were used to evaluate the diets’ apparent total tract digestibility (dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), crude fibres (CF), nitrogen free extractives (NFE) and ash) and coefficients (Cd) were used to calculate the diets’ feeding value. Two diets were used: conrol diet (CD) with SFM and experimental diet (ED) with RSM. The results indicated that feeding RSM tended to increase Cd OM (p=0.1), Cd CP (p=0.4), Cd EE (p=0.5) and Cd NFE (p=0.1). The differences were significant at Cd DM (p<0.05), Cd CF (p<0.05) and Cd ash (p<0.001). According to the calculation analysis, diet supplementation with RSM benefits total digestible nutrients (TDN), raised energy values (gross energy, digestible energy and net energy) and improved protein feeding values (protein trully digestible in small intestines (PDI) and balance of protein in rumen (BPR)). Therefore, it’s concluded that, substitution of SFM with RSM in cerealbased ruminant diets significantly (p<0.05) increased in vivo diet digestibility, raised (11 %) TDN and improved its energy and protein feeding value.