scholarly journals Effect of protease and duration of fattening period on dressing percentage of broiler chickens

2016 ◽  
Vol 32 (4) ◽  
pp. 353-360 ◽  
Author(s):  
Vladimir Doskovic ◽  
Snezana Bogosavljevic-Boskovic ◽  
Lidija Peric ◽  
Milos Lukic ◽  
Zdenka Skrbic ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Carcass Weight ◽  
Fast Growing ◽  
Protein Levels ◽  
Protease Enzyme ◽  
Body Weights ◽  
Dressing Percentage ◽  
Fattening Period ◽  
Experimental Group

This study evaluates the effect of different crude protein levels in broiler diets supplemented with 0.2% and 0.3% protease enzyme (Ronozyme Pro Act) on dressed carcass weight and dressing percentage during two fattening periods (49 and 63 days). The fast-growing strain Cobb 500 was used. At the end of the fattening trial i.e. at 49 and 63 days, 10 male and 10 female birds were randomly sacrificed from each experimental group to determine body weights and conventionally dressed, ready-to-roast and ready-to-grill carcass weights. The data obtained were used to calculate the dressing percentages of the differently dressed carcasses. Results indicated that carcass weights and dressing percentages were not affected by diet (P>0.05), but also showed that the increase in the length of the fattening period by two weeks (from 7 to 9 weeks) led to increased carcass weights, while dressing percentages decreased (P<0.05).

scholarly journals Effect of dietary protein level and length of fattening period on dressing percentage and carcass conformation in broiler chickens

2017 ◽  
Vol 33 (2) ◽  
pp. 211-219
Author(s):  
Vladimir Doskovic ◽  
Snezana Bogosavljevic-Boskovic ◽  
Zdenka Skrbic ◽  
Radojica Djokovic ◽  
Simeon Rakonjac ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Dietary Treatment ◽  
Abdominal Fat ◽  
Fat Percentage ◽  
Protein Levels ◽  
Dietary Protein Level ◽  
Dressing Percentage ◽  
Fattening Period ◽  
Almost All

This study analyses the effect of different protein levels in broiler feeds (supplemented with protease) and different lengths of fattening period on some parameters related to dressed carcass quality. Medium-growing Master Gris broiler chickens were used in a fattening trial lasting 63 days. At slaughter, dressing percentages and abdominal fat percentages were determined based on traditionally dressed carcass weights and abdominal fat weights of broilers at 49 and 63 days, and conformation indices were calculated based on absolute conformation measurements. Results showed that dietary treatment had an effect only on one relative conformation measurement - body weight/shank length in chickens at 49 days, as control broilers had higher values of this index compared to chickens receiving feeds containing reduced levels of crude protein and protease supplementation (0.2% or 0.3%). Length of fattening period affected almost all studied parameters, except breast angle, dressing percentage of traditionally dressed carcass and abdominal fat percentage.

scholarly journals EFEKAT ENZIMA PROTEAZE NA PRINOS I UDEO JESTIVIH PRATEĆIH PROIZVODA KLANJA PILIĆA HIBRIDA MASTER GRIS

2021 ◽  
Author(s):  
Vladimir Doskovic ◽  
◽  
Snežana Bogosavljevic-Boškovic ◽  
Zdenka Škrbic ◽  
Miloš Lukic ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Live Weight ◽  
Abdominal Fat ◽  
Control Group ◽  
Protein Levels ◽  
Percentage Yield ◽  
Almost All ◽  
Experimental Group ◽  
By Products

The effect of supplemental protease (Ronozyme ProAct) in broiler diet on the weights and percentage yields of slaughter by-products of male and female medium-growing Master Gris broiler chickens was analysed. Fattening period lasted for 63 days. Broilers were assigned to 3 experimental groups, each consisting of 100 birds. Experimental groups differed in protease levels used in their diets: control broilers (C) received complete feeds (starter, grower and finisher) without supplemental protease; chickens in the experimental group E-I were given a diet containing 0.2% protease and crude protein levels reduced by 4% compared with the control group, whereas experimental E-II broilers were fed a diet supplemented with 0.3% protease and containing crude protein levels reduced by 6% compared with C birds. The analysis of the results showed that feeding treatments had a very small effect on the weights and proportion yields of edible by-products (with difference only in the percentage yield of liver relative to live weight between C and E-I broilers, P<0.05), whereas sex was found to affect almost all slaughter by-products (except abdominal fat weight and the percentage yield of gizzard relative to live weight, P>0.05).

scholarly journals The effect of protease on productive and slaughter traits in broiler chickens

2012 ◽  
Vol 28 (4) ◽  
pp. 817-826
Author(s):  
V. Doskovic ◽  
S. Bogosavljevic-Boskovic ◽  
Z. Pavlovski ◽  
B. Milosevic ◽  
Z. Skrbic ◽  
...  
Keyword(s):  
Body Weight ◽  
Broiler Chickens ◽  
Abdominal Fat ◽  
Carcass Weight ◽  
Production Traits ◽  
Fast Growing ◽  
Protein Levels ◽  
Carcass Conformation ◽  
Slow Growing ◽  
Protein Diets

Carcass conformation is a very important parameter in assessing the overall appearance and meatiness of broilers. This study evaluates the effect of protease supplemented to reduced protein diets on production traits, dressed carcass weight and conformation measures in fast-growing Cobb 500 and slow-growing Master Gris broilers over a fattening period of 49 days. At slaughter, the following measurements were taken: pre-slaughter body weight (BW), conventionally dressed carcass weight and abdominal fat weight. Following carcass dissection into primal cuts, absolute conformation values, including metatarsus length (ML), keel length (KL), breast depth (BD), breast angle (BA) and thigh girth (TG), were determined. For carcass conformation evaluation purposes, index values of carcass conformation measures BW/ML, BW/KL, BW/BD and BW/TG were identified. Genotype and sex had a significant effect on dressed carcass weight and all conformation measures, whereas the effect of different protein levels in protease-supplemented diets was significant only in Master Gris, for metatarsus length and the following indices: BW/ML, BW/KL and BW/TG.

scholarly journals Effect of dietary protease supplementation and sex on dressing percentage and body conformation in broilers

2016 ◽  
Vol 32 (2) ◽  
pp. 185-193 ◽  
Author(s):  
Vladimir Doskovic ◽  
Snezana Bogosavljevic-Boskovic ◽  
Milos Lukic ◽  
Zdenka Skrbic ◽  
Simeon Rakonjac ◽  
...  
Keyword(s):  
Body Weight ◽  
Protein Content ◽  
Soybean Meal ◽  
Broiler Chickens ◽  
Research Results ◽  
Fast Growing ◽  
Body Conformation ◽  
Broiler Diet ◽  
Carcass Conformation ◽  
Dressing Percentage

This paper presents research results on the effect of protease on the dressing percentage of conventionally dressed carcass and body conformation in broiler chickens. Broiler diet was supplemented with 0.2% protease (group E-I) and 0.3% protease (group E-II), and protein content in the feed was reduced by 4% (E-I) and 6% (E-II) through a decrease in soybean meal content. Fast-growing Cobb 500 broilers were used for a 63-day fattening trial. Body conformation measurement included absolute carcass conformation measures (metatarsus length, keel length, breast depth, breast angle, thigh girth) and relative body conformation measures - conformation indices (body weight/metatarsus length, body weight/keel length, body weight/breast depth, body weight/thigh girth). Results showed a significant effect of sex on the dressing percentage of conventionally dressed carcass and all body conformation measures, whereas diet had a significant effect on the dressing percentage of conventionally dressed carcass and breast angle values.

scholarly journals Protein and energy relationships in the broiler chicken

1993 ◽  
Vol 70 (3) ◽  
pp. 667-678 ◽  
Author(s):  
R. W. Rosebrough ◽  
J. P. McMurtry
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Broiler Chicken ◽  
Protein Levels ◽  
Low Protein ◽  
Dietary Crude Protein ◽  
Energy Relationships ◽  
Limiting Amino Acid ◽  
Limiting Amino Acids

Male broiler chickens growing from 7 to 35d were fed on a diet containing 150g crude protein (N × 6·25)/kg diet supplemented with lysine to equal that in diets containing 166, 183 and 200g crude protein/kg diet (Expt 1). A second group of male broiler chickens growing over the same period were fed on a diet containing 120g crude protein/kg supplemented with lysine, arginine, tryptophan, threonine and isoleucine equal to that in diets containing 144, 172 and 200g crude protein/kg diet (Expt 2). Growth was improved by lysine supplementation but not to the level attained by feeding 200g crude protein/kg (Expt 1). Lysine, arginine, tryptophan, threonine and isoleucine supplementation of a low-protein diet also improved growth, but growth again fell short of that attained by feeding a diet containing 200g crude protein/kg. Plasma insulin-like growth factor-1 and thyroxine concentrations increased and triiodothyronine decreased as the crude protein level increased from 150 to 200g/kg diet. Supplemental lysine did not affect plasma levels of these hormones. Although dietary crude protein levels noticeably changed rates ofin vitrolipogenesis, changing either the level of a single limiting amino acid or the levels of several limiting amino acids did not change lipogenesis.

scholarly journals The effectiveness of the use of acidifiers in the industrial growing of broiler chickens

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
S. V. Demchuschun
Keyword(s):  
Broiler Chickens ◽  
Live Weight ◽  
Permissible Limit ◽  
Carcass Weight ◽  
Control Group ◽  
Feed Conversion ◽  
Inorganic Acids ◽  
Experimental Group ◽  
Overall Mortality

As an alternative to feed antibiotics for saving poultry livestock and increasing productivity the acidifiers based on organic and inorganic acids are used more and more frequently. The article represents the results of study of effectiveness of Fidacid acidifier usage for breeding broiler chickens. The study has been conducted on two groups of broiler chickens of Ross 308 breed. The chickens of the experimental group except the full feed–stuff have been given the acidifier at a rate of 1 liter per 1 ton of water. The watering has been carried out from the 27th day of feeding for 10 days (27 – 31 and 34 – 38 days). It has been established that the acidifier watering from the 27th day of breeding chickens has contributed to the increase of preservation of livestock in 4.6%. The overall mortality of chickens has decreased in 2 times (P ≤ 0,001) and amounted to 4.3%, with the permissible limit up to 5%. It has been found that the application of the acidifier has promoted the economy of feed at higher productive indices. There has been a decrease in cost of feed per 1 head in 8.7% (P ≤ 0,01) and a decrease in feed conversion in the experimental group in 0.19 units. This is the evidence of better digestibility of feed and its taking by the bodies of chickens. The live weight of broiler chickens of the experimental group on the 43rd day of breeding increased in 47 grams and carcass weight increased in 30 grams, that is in 1.8% and 1.6% (P ≤ 0,01), respectively. The European index of efficiency in the experimental group has been 56.5 units higher than in the control group of chickens.

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