2024-03-28T21:14:34Z
https://jappmu.journals.ekb.eg/?_action=export&rf=summon&issue=12505
Journal of Animal and Poultry Production
2090-3642
2090-3642
2012
3
4
EFFECT OF SEASONAL CHANGES AND TYPE OF ROUGHAGE ON: I- GROWTH PERFORMANCE, METABOLIC ACTIVITY AND CARCASS CHARACTERISTICS OF CROSSBREED LAMBS
M.
Abd El-Hady
Eighteen growing crossbreed lambs (23.2±0.91 kg average live body weight; 5 month old) were used to investigate growth performance, feed efficiency, metabolic aspects and carcass characteristics of lambs as affected by type of roughage under different seasons. Lambs were randomly distributed to three experimental groups (six for each). First group was fed starter concentrate feed mixture (CFM) and berseem hay (R1;as a control). Whereas, other groups were fed CFM plus berseem silage supplemented with either 5% ground yellow corn (BSC; R2) or lactic acid bacteria and yeast mixture (BSB; R3) during ensiling process. The local environmental temperature was recorded monthly. Daily weight gain, relative growth rate, daily dry matter intake and feed conversion were recorded. Also, production and economic efficiency of lambs were calculated. The adjusted net energy of maintenance (NEm) and growth (NEg) were calculated according to thermal air temperature. Results showed that total gain and average daily gain of lambs fed R2 were higher than other groups with no significant differences, while feed conversion in R3 was better than other groups (7.771 vs. 9.425 and 8.497 for R3, R1 and R2, respectively) owing to the lowest total dry matter intake with R3.The NEm was slightly higher in R2 than other groups. Whereas, R3 was the lowest (P<0.01) value of NEg. Retained energy and production efficiency were higher (P<0.01) in R3 than other groups and followed by R2. Carcass characteristics of lambs did not differ significantly among groups. However, R2 showed better values of hot dressing%, L.D weight, DM and CP%. It can be concluded that, both ground yellow corn and biological supplements to ensiling process of berseem improved feed conversion and production efficiency of lambs. The best growth performance, profit and economic efficiency under the local thermal temperature was recorded in groups fed berseem silages, specially in R2, compared with control which fed berseem hay as a basal diet.
lambs
Growth
carcass
net energy
seasonal changes
roughage
2012
04
01
167
181
https://jappmu.journals.ekb.eg/article_82785_b76f43e93fb99c66ea3b205af7df1e6d.pdf
Journal of Animal and Poultry Production
2090-3642
2090-3642
2012
3
4
EFFECT OF SEASONAL CHANGES AND TYPE OF ROUGHAGE ON: II- NUTRITIVE VALUES, RUMEN FERMENTATION AND BLOOD METABOLITES OF CROSSBRED LAMBS
M.
Abd El-Hady
S.
El-Ayouty
S.
Sayed
A study was conducted to determine nutrients digestibility, ruminal fermentation and blood constituents of growing lambs fed berseem silages. Eighteen growing crossbreed lambs (23.2±0.91 kg average live body weight; 5 months old) were randomly distributed to three experimental groups (six in each). First group was fed starter concentrate feed mixture (CFM) and berseem hay (R1; as a control). Whereas, other groups were fed CFM plus berseem silage supplemented with either 5% ground yellow corn (BSC; R2) or lactic acid bacteria and yeast mixture (BSB; R3) during ensiling process. Blood samples were collected monthly to determine different metabolites. Before finishing the experiment, three digestibility trials were conducted using three lambs for each ration at average body weight 39.0 kg ±0.72 and 9 months of age. Daily dry matter intake (DMI), digestibility and feeding values were calculated. Also, rumen liquor parameters were measured pre- and post-feeding. The results indicated that the DMI appeared to the highest(P<0.05) significant with R2 followed by R3 due to DM% of silage. As well as, the CP intake was the greatest (P<0.05) in R2 than other groups. The digestion coefficient of all nutrients in R2 were significantly (P<0.01) greater in R2 than other rations, except for OM, CP, EE and CF which were slightly higher with no significant differences. Whereas, R3 was the greatest (P<0.01) hemicellulose digestibility and the lowest (P<0.01)of cellulose. The values of TDN, DCP,TDN:CP ratio, ME, NE and CPI:MEI ratio did not vary significantly among treatments. The intake of TDN and DCP were greater (P<0.01) in R2 than other groups, whereas R1 had the highest (P<0.01) value of NFCI and NFCI:DCPI ratio. The quality index of rations was higher (P<0.01) value in R2 compared with other rations. The ruminal pH and effective NDF values were affected (P<0.01) by dietary treatments and sampling time. The highest (P<0.01) value of ruminal ammonia-N recorded with R1 than the others. However, ruminal TVFA's and buffering capacity tended to the lowest (P<0.05) in R1. Blood metabolites did not differ significantly among groups except for blood protein, albumin and globulin which were higher in control than treated groups. It can be concluded that growing lambs fed ration containing CFM plus berseem silage supplemented with 5% yellow corn had higher nutrients intake, digestibility, quality index, ruminal TVFA's and buffering capacity and consequently had the best performance.
Roughage type
nutritive value
blood metabolites
lambs
2012
04
01
183
198
https://jappmu.journals.ekb.eg/article_82787_7c708fe31a60f7eb6087d719191bf985.pdf