Feeding Value of Oilseeds Rich in Omega 3 Fatty Acids as Potential Ingredients in Broiler Nutrition

Due to the benefits of consuming products rich in omega-3, people have become more aware of the need for a surplus of n-3 fatty acids for meat in their diet. Three oilseeds rich in omega 3 fatty acids (linseed, hemp seeds and camelina seeds) were characterized to determine their nutritional value for inclusion in broiler diets to increase the PUFA content of poultry meat. Chemical determinations revealed a different protein content ranging between 19.74% (hemp seeds) and 26.78% (linseed). In terms of polyunsaturated fatty acids, especially α-linolenic acid was determined for linseed (50.71g/100g total fatty acids), camelina (34.15g/100g total fatty acids) and hemp (14.2g/100g total fatty acids). The selected products rich in polyunsaturated fatty acids will be introduced into the feed and tested on batches of broilers to track the best growth performance

STUDY ON THE HERITABILITY OF MILK PRODUCTION IN A LINE OF HOLSTEIN FREISE

Livestock genetical structure improvement from one generation to another request, among others, the knowledge of their genetical parameters. The guidance of livestock genetical structure involves the knowledge of the share caused by genetical and environmental factors concerning the variability observed at the livestock level. The knowledge of heritability coefficient values makes easy the livestock genetical improvement, this one indicating the resolution of the traits to be improved. In this respect, there was estimated the milk production heritability, of the protein percent, of the fat percent, in a line of Holstein-Friese, during three generations. The heritability coefficients analysis, estimated by means of the interclass correlation method, for the three traits in the lactations dynamics, emphasized different values from one lactation to another, values justified by different sample genetical structures and respectively the different environmental conditions where these ones evolved. With little exceptions, the heritability coefficients values were comprised between 0.2 and 0.4, values which frame the traits within the group of those intermediary heritable. This genetical determinism of the analysed traits within the line of Holstein-Friese recommends that this one may be relatively easy to improve

Effect of the high fibre (8%) layer diets on digestive tract integrity

Although fibre is regarded by many nutritionists as a mere diluent of poultry diets, new experimental evidences suggest that the dietary fibre positively influences the digestive tract integrity. A 5-week feeding trial was conducted on 200 Tetra layers (28 weeks) assigned to 5 groups, housed in an experimental hall under controlled environmental conditions (temperature: 23.81±1.54°C; humidity: 64.76±11.93%), and 16h/24h light regimen. The control group (C) received a conventional diet (2780 kcal/kg metabolizable energy; 17.5% crude protein; 4.39% crude fibre). Compared to C formulation, E1 formulation included 23% sunflower meal, which increased the dietary fibre (8%). The other 3 experimental diet formulations differed from E1 formulation by the presence of phytoadditives or cellulolytic enzymes: E2 (0.015% enzyme); E3 (0.015% phytoadditive) and E4 (0.015% enzyme+0.015% phytoadditive). At the end of the experiment 30 hens were sacrificed (6 hens/group) to obtain jejunum samples for histological parameters. The results of the intestinal measurements revealed significantly (P≤0.05) lower values for experimental groups compared to C group. The lowest values registered for E1 group: villus height (583±99.74µm) and crypt depth (126±36.19µm). Mucosa thickness increased significantly (P≤0.05) in E3 group (275±70 µm) compared to C group (173±66.08 µm)