EFFECT OF FEED WITHDRAWAL PRESLAUGHTER ON SOME CARCASS TRAITS OF BROILER
Tork
Dorra
Poultry Prod. Dept., Fac. Agric., Mansoura Univ.
author
T.
Tag- El-Din
Poultry Prod. Dept., Fac. Agric., Mansoura Univ.
author
El-Samra
Abo Egla
Poultry Prod. Dept., Fac. Agric., Mansoura Univ.
author
Eman
Elsaid
** Poultry Prod. Dept., Fac. Agric., Damietta, Mansoura Univ.
author
text
article
2011
eng
In This study, 48 broiler chicks were used in 8 groups to evaluate the optimum time of pre-slaughter feed withdrawal (FW) for broiler chickens in order to investigate the effect of different pre-slaughter feed withdrawal periods (0.0, 4.0, 8.0 and 12.0 h) and live body weight grade at slaughter (grade A1 from 1800 to 2000g and grade A2 from 1600 to 1800g) on weight loss, carcass parts, carcass traits, giblets weight, gizzard content weight, water holding capacity (WHC) and pH values of breast and thigh meat. Some blood plasma constituents (glucose, triglycerides, uric acid and total lipids) and chemical composition of meat as well as determining its effects on meat yield.
The obtained results showed that both of relative and absolute weight loss, carcass parts, dressed carcass, protein and ash content of thigh and breast meat, WHC values were significantly (p≤0.01) increased gradually with the increasing of FW period from 0.0 up to 12.0 h before slaughtering. On the other hand, both of absolute and relative weight of abdominal fat, giblets and gizzard content, concentration of glucose, pH value and moisture and fat content of breast and thigh meat decreased as the FW period increased. It were observed that the higher values of plasma triglycerides and total lipids were recorded for broiler of 8.0 h FW experimental group.
Results show that the weight grade had significant (p≤0.01) effects on the absolute weight of abdominal fat, carcass parts and dressed carcass, relative weight of giblets, chemical composition of meat and W H C and pH values. In the same way the relative weight loss, abdominal fat and thigh weight and concentration of glucose was significantly ( p≤0.05) affected by weight grade. However, absolute weight loss, gizzard content and giblets, as well as, relative weight of dressed carcass and concentration of uric acid, plasma total lipids and triglycerides were not significantly affected by weight grade. It was observed that the grade A2 had higher values of relative weight loss, gizzard content and giblets than grade A1 by about 7.9, 11.5 and 9.3%, respectively. In comparison the grade A1 had higher values of absolute weight of abdominal fat, carcass parts and dressed carcass than grade A2 by about 20.1, 16.5, 14.8 and 14.1%, respectively.
This study revealed that the optimum feed withdrawal times pre-slaughter for broiler chickens ranging from 8.0 to 12.0 h showed the best results of carcass traits and quality. In addition, the slaughtering of broilers at 1600 – 1800g resulted in better values of the same traits than those slaughtered at 1800 – 2000g.
Journal of Animal and Poultry Production
Mansoura University, Faculty of Agriculture
2090-3642
2
v.
9
no.
2011
335
348
https://jappmu.journals.ekb.eg/article_83394_96ea6cd3233f34af7cb2376d90e4266a.pdf
dx.doi.org/10.21608/jappmu.2011.83394
EFFECT OF FEEDING DIFFERENT LEVELS OF ORANGE WASTE SILAGE ON PRODUCTIVE PERFORMANCE OF LACTATING FRIESIAN COWS.
I.
Shakweer
Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Dokki, Giza, Egypt
author
text
article
2011
eng
Twenty lactating Friesian cows at the peak of lactation curve and in their first to third parity were used to study the effect of feeding diets containing different levels of orange waste silage on the nutrient digestibility coefficients and nutritive values of feeds, ruminal and some blood parameters and productive performance of Friesian cows .Friesian cows were chosen and divided into four similar groups (5 cows each) according to body weight, milk yield and number of lactations. Animals were fed on the following rations: First group was fed a control ration (R1) which consisted of 50% concentrate feed mixture (CFM), 45%, berseem hay (Trifolium alexandrinum) and 5% rice straw . Groups R2, R3 and R4 were fed the same formula of control with replacing 25, 35 and 45% of berseem hay by orange waste silage, respectively. Results indicated that cows fed R4 recorded significantly (P<0.05) higher digestibility coefficients of CP ,CF and EE than that of (R1) and showed higher DM and OM digestibility coefficients with no significant differences, while ration (R2) appeared to the highest (P<0.05) significant in CP digestibility, TDN recorded significantly (P<0.05) increased with increasing orange waste silage level, showing the highest TDN %with (R4) , while highest DCP%was found with (R2) . Cows fed R4 recorded the highest ruminal TVFA's concentration .While , NH3-N concentration in rumen liquor decreased significantly with increasing level of orange waste silage in the rations. Concentration of total protein , albumin and globulin significantly (P<0.05) increased with R2 , while activities of GOT and GPT were significantly (P<0.05) lower with level 25% of orange waste silage .Cow fed R4 recorded significantly (P<0.05) the highest yield of actual milk and 4% FCM ,while those fed R3 recorded significantly (P<0.05) the highest of milk contents .Cow fed R4 showed the highest feed and economic efficiencies , while those fed the control ration had the lowest values. It could be concluded that, using orange waste silage as a source of roughage is more efficient especially during summer season under Egyptian conditions to replace berseem hay . Using 25% , 35% and 45% orange waste silage as a roughages replacement in the rations of lactating Friesian cows resulted in higher milk production and improve feed utilization and economic efficiencies, especially using 45% orange waste silage as a roughages replacement in the rations of lactating cows .
Journal of Animal and Poultry Production
Mansoura University, Faculty of Agriculture
2090-3642
2
v.
9
no.
2011
349
360
https://jappmu.journals.ekb.eg/article_83396_dfc34df957af3ae7d641efc11e409f5d.pdf
dx.doi.org/10.21608/jappmu.2011.83396
EFFECTS OF GRADED LEVELS OF POTATO BY-PRODUCT AND TOMATO POMACE ON THE PERFORMANCE AND CARCASS CHARACTERISTICS OF BROILER CHICKENS.
Tork
Dorra
Poultry Production Dept., Fac. Agric., Mansoura Univ.,Egypt,
author
Amina
El-Serwy
Poultry Production Dept., Fac. Agric., Mansoura Univ.,Egypt,
author
M.
El-Shenawy
Animal Production Dept., Fac. Agric., Mansoura Univ., Egypt,
author
Akila
Hamza
Regional Center for food and feed, Agric. Res. Center, Giza, Egypt.
author
M.
Abdel-Moneim
Regional Center for food and feed, Agric. Res. Center, Giza, Egypt.
author
text
article
2011
eng
The objective of the present study was to evaluate the potato by-product (PB) and tomato pomace (TP) as unusual feedstuff in broiler diets in terms of performance and carcass characteristics. A total number of 504 one day old male Ross broiler chicks were used in the experiment. The by-products were added to the experimental diets at 8, 16 and 24 % of the diet. After that, the experimental diets were divided into two groups. The first group was supplemented with enzyme mixture while the other group was free of enzyme supplementation. Two control diets were also used as positive and negative control. Each dietary treatment was fed to 3 replicates of 12 chicks each up to 35 days of age. The results of the experiment showed that significantly lower body weights and weight gain were recorded for the two groups fed 24% potato by-product with or without enzyme supplementation when compared to their respective controls. On the other hand, no significant differences in body weight and weight gain were observed for the birds fed Tomato pomace (TP) at different replacement levels compared to their respective control groups whether the birds fed diets supplemented with enzyme or not. All the groups fed TP at different replacement levels, whether supplemented or not with enzyme and the groups fed PB (8%) andPB(16%) without enzymerecorded significantly higher feed intake in comparison with their respective control group. Non significant differences were obtained among different groups for carcass parameters. The addition of enzyme enhanced in general the numerical values of chicken performance parameters. It could be concluded that either potato by-products (PB) or tomato pomace (TP) could be incorporated into broilers’ diets by replacement levels up to 16%. The negative effect of high fiber content on chickens’ performance could be avoided by addition of fiber degrading commercial enzyme to the diets.
Journal of Animal and Poultry Production
Mansoura University, Faculty of Agriculture
2090-3642
2
v.
9
no.
2011
361
373
https://jappmu.journals.ekb.eg/article_83397_4d391d21c1b48ad764d360d2e014f6cc.pdf
dx.doi.org/10.21608/jappmu.2011.83397