ORIGINAL_ARTICLE
EFFECTS OF FEEDING HIGH-NUTRIENT-DENSITY DIETS ON PERFORMANCE OF BOVANS WHITE HENS REARED UNDER SUMMER CONDITIONS IN EGYPT
The present study was undertaken to determine the effects of feeding diets containing high nutrient concentrations on laying performance and egg quality of Bovans White laying hens during the summer season in Egypt. Two hundred hens were randomly distributed into five equal experimental groups, each composed of five replications. Hens were maintained at community cages (8 birds/cage) and subjected to similar hygienic and managerial conditions.A corn-soybean meal-based diet, containing 17.40% crude protein, 2880 kcal/kg of metabolizable energy, 4.35% calcium, 0.43% nonphytate phosphorus, 0.84% lysine, 0.41% methionine, and 0.70% methionine plus cysteine, was formulated in mash form and used as a control. The concentration of nutrients was increased to be 102.5, 105, 107.5 and 110% of those present in the control diet through some dietary manipulations, thus five mash experimental diets were formulated and fed to hens. The laying performance was evaluated in terms of egg production rate, egg weight, daily egg mass, daily feed intake and feed conversion ratio during three 28-day periods, from 44 to 56 weeks of age. An egg quality test was also performed to determine the effects of feeding the high-nutrient-density diets on egg components and some exterior and interior parameters of egg quality at the last week of study.
At the first 4-week period, feeding the high-nutrient-density diets had no significant effect on laying performance of hens but daily feed intake was inconsistently affected.At the second period, hens fed high-nutrient-density diets achieved significantly higher egg production rate (EPR) and daily egg mass (DEM) compared with the control group while egg weight (EW), daily feed intake and feed conversion ratio (FCR) were not affected. At the third period, hens fed 105 and 107.5% diets consumed significantly more feed and displayed higher EPR and DEM than those of other dietary treatments but EW and FCR were not affected. Feeding the high nutrient density diets produced significant improvements in egg weight, yolk index and Haugh units compared with their control counterparts while percentages of egg components, shell weight per unit surface area (SWUSA), egg shape index and yolk color score were not affected. It is concluded that increasing dietary nutrient density up to 110% of the recommended requirements of Bovans White laying hens can positively affect some egg quality traits but had inconsistent effect on their productive performance under Egyptian summer conditions.
https://jappmu.journals.ekb.eg/article_52926_03d02f84305779034065e75930408425.pdf
2015-09-01
597
608
10.21608/jappmu.2015.52926
Bovans White hens
performance
egg quality
summer conditions
Hayam
Abo El-Maaty
1
Poultry Production Department, Faculty of Agriculture, Mansoura University, Egypt.
AUTHOR
F.
Ismail
2
Poultry Production Department, Faculty of Agriculture, Mansoura University, Egypt.
AUTHOR
M.
Rabie
3
Poultry Production Department, Faculty of Agriculture, Mansoura University, Egypt.
AUTHOR
A.
Aswad
4
Poultry Production Department, Faculty of Agriculture, Mansoura University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
GROWTH PERFORMANCE, SOME RUMEN PARAMETERS AND BLOOD PROFILE OF MALE ZARAIBI GOATS FED DIETS ADDED WITH CHUFA TUBERS (CYPRUS ESCULENTUS L.)DURING THE GROWING PERIOD
This research work was carried out to investigate the effect of adding Egyptian Chufa tubers in goats diets on nutrients digestibility, some rumen and blood parameters and growth performance of Zaraibi goats kids. Eighteen kids (average 21.3±0.45 kg live weight) were divided into 3 groups (6 kids each). Animals in groups G1, G2 and G3 received 0, 5 and 10 g Chufa tubers /head/day, respectively in their diets. In addition, 9 Zaraibi bucks averaging 51.0 kg body weight were used in three digestion trails. The obtained results showed that the digestion coefficients of all nutrients as well as the feeding values (TDN and DCP %) were significantly improved (P<0.05) as a result of adding Chufa tubers. Ruminal NH3-N concentration was tended to decrease with increasing level of Chufa tubers. But, ruminal total VFA’s concentration was increased with increasing level of Chufa tubers. Molar proportion of ruminal VFA’s showed higher acetate (P<0.05) and propionate concentration but lower butyrate with the two treatment groups (G2 and G3) compared with G1. Daily body gain recorded the highest (P<0.05) value (90.22g) with G3 followed by G2 (84.67g) and lastly G1 (76.07 g/head/day). The best feed conversion efficiency, based on DM, TDN and DCP was 8.51, 5.91 and 0.743, respectively with G3 in comparison with the other groups. The feed economic efficiency was tended to be increased with increasing level of Chufa tubers in goats diets.
https://jappmu.journals.ekb.eg/article_52928_0def38dce489d6156dbb0d4491ff40da.pdf
2015-09-01
609
621
10.21608/jappmu.2015.52928
Zaraibi kids- Chufa tubers- growth performance- rumen parameters- Feed economic efficiency
A.
Gabr
1
Fac. Agric., Mansoura Univ., Mansoura, Egypt.
AUTHOR
M.
Ahmed
2
Animal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.
AUTHOR
Fathia
Ibrahim
3
Animal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.
AUTHOR
M.
Seleem
4
Animal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.
AUTHOR