EFFECT OF CONCENTRATE WITH AMMONIATED SUPPLEMENT ON: 2. MILK YIELD AND BLOOD PARAMETERS OF LACTATING FRIESIAN COWS. | ||||
| Journal of Animal and Poultry Production | ||||
| Article 10, Volume 30, Issue 12, December 2005, Page 7401-7411 PDF (3.33 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2005.238451 | ||||
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| Authors | ||||
| M. M. EI-Shinnawy1; Eman H.M. Maklad1; H. M. Ead2; A. M. Abdel-Khabir2; M. E. Sayed-Ahmed2 | ||||
| 1Animal Production Department, Faculty of Agriculture, Mansoura University, Egypt. | ||||
| 2Animal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| The effect of substitution of concentrate feed mixture (CFM) by yellow corn fed along with ammoniated nce straw plus bentonite ration of lactating cows on their performance for milk yield and composition as well as blood metabolities was investigated. Twenty lactating rriesian cows with body weight ran~ing from of 450 to 620 kg werE used in this study. All animals were in the 2nd to 4t lactation season. Cows were randomly distributed into five similar groups for days after calving (tour animals each). The exprementa' period lasted for 140 days after calving (20 weeks) . the experimental rations were formulated as follows :G 1 Control: 70 % concentrate feed mixture (CFM) + 30 % rice straw (RS), G 2: ration 1 : 70 % (CFM) + 30 % ammoniated rice straw (ARS) +bentonite (8) , G 3 : ration 2: 65 % (CFM) +5% ground corn grain (GCG) + 30 % (ARS) +(8), G 4 : ration 3 : 60 % (CFM) +10% (GCG) + 30 % (ARS) +(8) and G 5: ration 4: 55 % (CFM) +15% (GCG) + 30 % (ARS) + (8) . These proportions were chosen to achieve approxmitley iso nitrogenous ration containing about 12-13% CPo The obtained results showed that urea-N concentration for blood serum ranged from 17.5 (ration 3) to 31.8 (control) mg/100 ml and its levels was significantly (p < O. 05) decreased by increasing replacement corn grain in the ration 3 & 4 . The serum glucose cocentration ranged between 44.6 to 59.2 mg/100 ml with different rations and its :evel was significantly (p < 0.05) decreased by increasing replacement corn grain, compared with the control and ration 1. The average daily fat corrected milk (FCM) yield was the highest (p < 0.05) with group fed ration 4 (24.2 kg/d), when compared with the other rations. The persistency period with replacement corn grain and bentonite supplementation was longer than both the control or ration 1. The solids non fat (SNF%), protein yield (kg/d) and lactose yield (kg/d) were increased (p < 0.05) wit'i increased the replacement of corn grain and bentonite supplementation, based on the average values, the highest (p < O 05) was with the ration 4 compared with the other rations. The net energy of ration (NEo Mcal/kg) values were significantly (p < 0.05) higher with ration 4 (1.8 Mcal/kg) than with the other rations, but the net energy (NEL Mcal/kg milk) value was not significantly different among treatments and the highest value was recorded when feeding on ration 1 (0.615 Mcal/kg milk) but the lowest value was with ration 4 (0.574 Mcal/kg). The feed conversion (NEL/NEo) values were significantly (p < 0.05) increased with the control or ration 1, compared with the other ones and the lowest value was noticed with the ration 4 (31.88%) .The highest value of feed cost was estimated with ration 4, but the lowest value was with the control. The highest value of the total output as the price of fat corrected milk (FCM) was recorded with feeding ration 4, but the lowest value was with the control. The results of return (profit L.E) , showed that the highest return was obtained when feeding on ration 4, followed by ration 1 and the lowest was with ration 3. | ||||
| Keywords | ||||
| lactating cows; ground corn grains; ammoniated rice straw; bentonite; llJilk yield | ||||
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