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• Feed Intake, Digestibility and Methane Emission of Dry Cows as Affected by Supplementation of Cottonseed Oil

  Chu Manh Thang, Tran Hiep

  Date Received: 16-04-2020 / Date Accepted: 25-05-2020

   Abstract PDF (VIETNAMESE)

  The study aimed to evaluate the effect of supplementation of cottonseed oil on feed intake, digestibility and enteric methane emission of dry cows. A total of 24 dry cows at 2-6thlactation cycles were used in the experiments. The experimental animals were allocated according to a completely randomized design (CRD) tofour groupswithsix replications. The experimental diets comprised basic diet supplemented with cottonseed oil at levels of 0%; 1.5%; 3.0% and 4.5% of DM intake corresponding to the diet of control, KP1.5; KP3.0 and KP4.5, respectively. Results showed that the supplementationof cottonseed oil at 1.5%-3.0% improved total ME intake (from 17.6% to 18.1%) comparedto those fed control diet. The supplementation levels also reduced the total methane emission and methane emission intensity (from 18.1% to 19.2% methane/kg DMI). It may therefore be concluded that the supplementation of cottonseed oil at 1.5%-3.0%DMIhas a beneficial effect on feed intake, digestibility of dry cow witha reduction in CH4emission.

• Edible Biomass Productivity and Quality of Forages as Feeds for Dairy Cows in Nghia Dan, Nghe An

  Hoang Van Tao, Tran Duc Vien

  Date Received: 29-10-2011 / Date Accepted: 27-02-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  The experiment was conducted in Nghia Dan, Nghe An to select varieties with high edible biomass yield and quality of forages used as feeds for dairy cows. 15 varieties were tested including 8 varieties of gramineae, Brachiaria Mulato II, Panicum maximum TD58, Panicum maximum cv., Panicum maximum Mombasa, Pennisetum purpureum cv., Paspalum atratum, Sorghum bicolor cv. and maize C919 and 7 varieties of legumes, Stylosanthes guianensis Ubon, Stylosanthes guianensis CIAT184, Croatalaria; Burgady bean; Sardy Ten, Ebody Cowpea and Leucaena leucocephala. The testing varieties were planted in a randomized complete block design (RCB) with three replicates on moderately acidic soils but rich in phosphorus in the area with annual rainfall of about 1600mm. Six varieties, namely Mulato II,  P.maximum Mombasa, P.maximum TD58, P.maximum cv., P. purpureum cv., Paspalum atratum,  produced 43.7 - 61.1 tones dry matter/ha/year. The green forage yield in dry season accounted for 37-41% and crude protein yield was 2.3 – 7.7 tones/ha/year. Two promising  leguminous varieties, Stylossanthes Ubon and Stylossanthes Guiassinensis CIAT 184 produced 27.05 -28 tones dry matter/ha/year, 3.9 – 4.5 tones/ha/year of crude protein. Seven of 15 varieties tested were found to possess high productivity and quality and they can be used as feed for dairy cows in Nghia Dan, Nghe An.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.

• Current Feeding Situation and Reproductive Performance of Brahman Crossbred Cows Bredwith Charolais, Droughtmaster and Red Angus Semen at Smallholders in Quang Ngai Province

  Le Dinh Phung, Dinh Van Dung, Le Dinh Phung

  Date Received: 14-09-2020 / Date Accepted: 24-10-2020

   Abstract PDF (VIETNAMESE)

  The objective of this study was to evaluate the current feeding situation and reproductive performance of Brahman crossbred cows bred with Charolais, Droughtmaster and Red Angus semen at smallholders in Quang Ngai province. A total of 90 households with Brahman crossbred were evaluated for cow feed and feeding situation. In addition, 373 Brahman crossbred cows were used to evaluate the reproductive performance, in which 127 cows were inseminated by Charolais, 120 by Droughtmaster and 116 by Red Angus. The results showed that the dry matter (DM), crude protein (CP) and energy (ME) intake of Brahman crossbred cows were not different (P >0.05) and independent from being bred with Charolais, Droughtmaster or Red Angus. The amount of DM, CP and ME intakenby the pregnant cows was 6.9-7.5; 0.6-0.7kg/day and 14.6-15.5Mcal/day, respectively, and 3-month after calving was 7.5-7.6; 0,7kg/day and 15.5-15.9Mcal/day respectively. The calving interval of Brahman crossbred cows bredwith Charolais, Droughtmaster and Red Angus semenvaried between 394-397 days (P >0.05). Further studies should be done on the growth and performance of the progeny of the crosses between Brahman crossbred cows and Charolais, Droughtmaster and Red Angus bulls.

• Scenarios for Reducing Enteric Methane Emission from Small Scale Dairy Production Farms in BaVi, HaNoi

  Le Dinh Phung, Le Duc Ngoan

  Date Received: 31-03-2015 / Date Accepted: 02-06-2015

   Abstract PDF (VIETNAMESE)

  An investigation was conducted to study the impact of alternative feeding practices on productivity and cattle enteric methane emissions of smallholder dairy systems in Ba Vi, Ha Noi. The study included two phases. During the first phase, data was collected in 30 farms in Ba Vi, Ha Noi through a semi-structured questionnaire. Average farm size (Mean± SD) was 0.85 ± 0.50 ha (15% crop area) and ~ 9 heads of pure and crossbred Holstein Friesian cattle. Herd structure consisted of 11, 25, 17 and 47% of calves, heifers, dry and lactating cows, respectively. Annual milk yield/farm was 28,655 ± 16,035 L (~US$ 20,059). Daily milk yield/cow was 14.1 ± 2.9 L. Using the feed supplied in each farm, the Ruminant model estimated yearly cattle enteric methane emission of 590 ± 359 kg per farm, 14.8 ± 8.99 tones CO2eq/farm and 0.52 ± 0.14 kg CO2 eq/L/milk. In the second phase, data was computed using a fixed representative farm to estimate responses to different feeding practices. Results showed that in comparison with Nepier grass (Pennissetum purpureum) and Guinea (Panicum maximum) or maize (Zea mays; 50% DM of the diet), the use of Ruzzi (Brachiaria ruziziensis) grass improved milk yield up to 14% and reduced enteric methane efficiency up to 9.4%. Potential increase of milk yield (5.3%) and decreased enteric methane efficiency up to 3.6% were predicted when maize silage substituted 50% of the elephant grass.