EFFECT OF FAT SUPPLEMENTATION ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF LACTATING FRIESIAN COWS DURING EARLY LACTATION | ||||
| Journal of Animal and Poultry Production | ||||
| Article 6, Volume 31, Issue 1, January 2006, Page 159-174 PDF (4.95 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2006.235410 | ||||
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| Authors | ||||
| A M. Metwally,1; E. M. Abdel-Raouf1; A. A. Shitta2; Y. M. EI-Diahy2 | ||||
| 1Animal Prod. Dept., Fac. Agric., Kafr El-Sheikh, Tanta Univ. | ||||
| 2Animal Prod. Res. Institute, Agric. Res. Center, Min. of Agriculture | ||||
| Abstract | ||||
| Eighteen lactating Friesian cows were assigned to three equal groups to study the effect of protected fat and palm oil supplemcntation on digestibility efficients, rumen fermentation, some blood constituents, milk yield and its omposition and reproductive performance during early lactation. The cows in the rst group were fed a basal ration only (G,). While, ¡n the other two groups 3% of ncentrate feed mixture was replaced by protected fat (GD) or palm oil (G3). The perimental period lasted 15 weeks after calving. Digestibility trials were carried out and rumen liquor samples were collected the end of the experimental period. Blood samples were regularly collected from imals at 3 week interval starting from day 21 after calving. Milk yield was recorded aeekly, while its contents were analyzed once every three weeks. S Results indicated that feeding protected fat and palm oil significantly (P < 0.05) reased digestibility coefficients of DM, 0M, CF, EE and NFE and subsequently and DCP values compared to control group, while, ruminai pH and ncenirnrinn of TVFA’s were not affected. Adversely, ammonia-nitrogen ncentration decreased significantly (P < 0.05) with supplementations. Concentrations of total protein, albumin, globulin, total lipids and HDL ¡n blood were highest in cows fed ration supplemented with palm oil. Cows fed tecteci fat expressed the highest concentrations of total cholesterol, LDL and çlycerides compared with the other two groups. Actual milk yield and 4% fat corrected milk were significantly (P < 0.05) high tc cows fed protected fat followed by cows ¡n G3, while the lowest levels were found he control group. Yields of milk fat, protein, lactose, total solids and solids not fat re significantly (P < 0.05) higher for cows fed protected fat and palm oil compared cows fed the control rations. Days open in G3 recorded the longest period followed by G2 and the least was i ‘i,. Number of insemination per conception in G2 was 2.0 being insignificantly less Dan that G and G3 (2.5). Conception rate within 150 day postpartum and after the insemination was significantly (P <0.05) higher in G3 compared to G, and G2. This study indicated that protected fat and palm oil supplementation in ration iairy cows improved their feed efficiency and reduced the intake of DM and DCP ired to produce 1 kg 4% FCM. Moreover, economic efficiency for cows fed ted fat and palm oil was significantly higher compared with cows fed control | ||||
| Keywords | ||||
| Friesian cows; protected fat; palm oil; digestiblities; blood; milk composition; reproductive performance | ||||
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