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New approach for using heart girth for calculating energy requirements: 3- for fattening friesian crossbred male calves
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Abstract: Twenty male Friesian crossbred calves of 180 kg average live body weight (LBW) were divided into four groups. Animals were fed according to NRC (1984) allowances (T1). animal heart girth (HG)x0.028 (T2). animal (HG)x0.032 (T3)and animal (HG)x 0.034 (T,4). The average daily gain in T4 was significantly higher than T2 and non significantly higher than T1 and T3 The fourth treatment was economically more efficient as well as in feed conversion than the other treatments with no significant differences among them. Every cm of HG in T4 (The best treatment in average daily gain. feed conversion and economic efficiency) required 0.055, 0.048, 0.006, 0.025 and 0.033 kg from DM, OM, CP, SE and TDN, respectively. Also, the results showed that every kg of DM, OM, CP, SE and TDN in T4 was consumed by the following numbers of cm of animal HG: 18.0, 21.0, 162.9,39.6 and 30.2, respectively.
Therefore, the nutrient requirements of male Friesian crossbred calves can be predictied from the following equations
:DM requirement (kg) = Animal HG x 0.055
OM requirement (kg) = Animal HG x 0.048
CP requirement (kg) = Animal HGxO.006
SE requirement (kg) = Animal HG x 0.025
TDN requirement (kg)= Animal HG x 0.033
Or:
DM requirement (kg) = Animal HG 118.0
OM requirement (kg) = Animal HG 121.0
CP requirement (kg) = Animal HG 1162.
SE requirement (kg) = Animal HG 1 39.6
TDN requirement (kg)= Animal HG 1 30.2
The results of this study showed that the small holder can use the following equations to obtain the feed quantity for male Friesian crossbred calves which fed concentrate feed mixture (CFM), berseem hay and rice straw:The requirement of CFM (kg) = Animal HG x 0.042 or Animal HG/26.1, .
The requirement of berseem hay (kg)=Animal HG x 0.0094 or Animal HG/106.7, and The requirement of rice straw (kg) =Animal HG x 0.013 or Animal HG/76.6 Roughage:concentrate ratio will be 0.60:0.40 by using the previous equations.
Keywords: Friesian calves, heart girth, nutrition requirements.
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| Publication year |
2002
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| Pages |
803-817
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد - الدقى - الجيزة
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| Availability number |
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| Organization Name |
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| City |
المنصورة
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| serial title |
Journal Agricultural Science Mansoura University
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| Department |
Cattle Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Calves.
Crossbreds.
Males.
Nutritional status.
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| Proposed Agrovoc |
heart girth;
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| Publication Type |
Journal
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