University of Khartoum

Response Of Dairy Cows To Feeding On Two Rations With Alfalfa Forage Supplementation

Response Of Dairy Cows To Feeding On Two Rations With Alfalfa Forage Supplementation

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Title: Response Of Dairy Cows To Feeding On Two Rations With Alfalfa Forage Supplementation
Author: Ibrahim, Mohamed Osman Ali
Abstract: This study was conducted at Kenana, White Nile State (Kenana Sugar Co.) at the Dairy Farm to evaluate the effects of two dairy rations on cow performance. One ration was the normal Kenana dairy ration based on sugarcane byproducts while the second was based on conventional feed resources. Fourteen dairy cows at different parity were used in this trial. The cows were divided into two similar groups based on their initial milk yield and parity. One group was randomly assigned to the control ration while the other was fed on the experimental one. The cows were kept in separate barns and individually fed. Alfalfa hay was supplemented to both groups. The experimental group was given a daily fixed quantity of 5 kg fresh alfalfa forage per cow whereas cows on the control ration received alfalfa forage ad libitum. Daily feed and alfalfa samples were collected and analyzed for proximate chemical entities. Data recorded were feed intake and daily milk yield. The trial was first laid out as a randomized complete block design with seven replications (each two cows of the same parity, initial milk yield comprising a replicate). The data were then arranged in a 2x4 factorial experiment to study the effects of ration and parity (2 rations and 4 parities) on feed consumption, nutrients intake and FCR. Data on feed consumption, nutrients intake and milk yield for the first four weeks were arranged in 2x4x3 factorial experiment (2 rations, 4 parities, 3 milking times) in a completely randomized design to study the effects of ration, parity and milking times on dairy cows performance. The trial lasted for twenty one weeks during the period Jan to May 2009. The experimental ration had higher crude fiber and NFE contents while the control ration had higher crude protein and ether extract contents and higher energy density. CP contents for the experimental and control rations were 17.57 and 25.55%, respectively, whereas the respective energy density were 10.24 and 12.40 MJ/kg DM. Alfalfa forage had higher moisture content (45.0%). CP contents in alfalfa forage were comparable to that of the control dairy ration and were higher than that of the experimental ration. Control cows consumed more (P < 0.01) total, weekly and daily feed quantities in comparison with cows on the experimental ration. Daily feed consumption for dairy cows on the control and experimental rations were 19.04 and 17.4kg/cow/day, respectively. Control cows consumed significantly higher (P<0.01) CP, EE, ash, and energy compared with cows on the Experimental ration, with the latter consuming significantly higher (P<0.001) NFE quantities (Table 3). Alfalfa supplementation to control cows contributed higher (P<0.001) nutrients in terms CP, EE, CF, NFE and ash compared with alfalfa quantities supplemented to the dairy cows on the experimental ration. Ration exerted a very highly significant (P<0.001) main effect on feed conversion ratio (FCR, kg feed/liter of milk). Dairy cows on the control ration consumed less (P<0.001) feed to produce one liter of milk compared with those on the experimental ration. The former needed 36.6% (0.37 kg of feed) of the total quantity of feed consumed by dairy cows on the experimental ration (1.004 kg) to produced one liter of milk. Cows at the 4th parity had comparatively higher VI average total feed intake compared with cows at earlier parities. Again, cows at the 4th parity had relatively higher CP, EE, Ash, NFE and energy intake in comparison with those at earlier parities. Dairy cows on the control ration recorded the highest (P<0.05) milk yields thought the experimental period. Average respective daily milk yields were 19.4 and 15.6 liter/cow/day. Cows at the 3rd parity produced the highest (P<0.01) milk yield and the lowest yields were recorded by those at the 2nd parity. Noon milking resulted in comparatively higher (P>0.05) milk yields, followed by morning milking and the lowest milk yields were obtained from evening milking. Cows on the experimental ration at the 1st parity recorded the highest milk yields whereas those on the same ration at the 4th parity had the lowest yields. Feed consumption was found to be highly and positively correlated to the intake of CP, CF, NFE and energy, and negatively correlated to the EE intake. Milk yield/cow was positively correlated with feed consumption, CP, CF, NFE and ME intakes and negatively correlated with EE intake. It was concluded that dairy cattle performance was affected by feed composition and nutrients densities and that alfalfa forage supplementation to dairy cows was beneficial in adjusting protein, vitamins (vit. A) and mineral contents of the dairy ration. More research work is needed to study the effects of different feed resources in dairy cattle feeding. Further, the effects of milking frequency and parity should be thoroughly studies, together with the economics of the different dairy processes
Description: 62 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/15913
Date: 2015-07-05


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