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• Effects of Supplementation of Cotton Seed Oil on ThePerformance and Methane Emission of Lactating Dairy Cows

  Tran Hiep, Pham Kim Dang, Chu Manh Thang

  Date Received: 30-10-2015 / Date Accepted: 14-01-2016

   Abstract PDF (VIETNAMESE)

  The effects of supplementation of cotton seed oil on the nutrient intakes, milk yield, and methane emission of lactating dairy cows were studied inlactating Holstein Friesian cows from Feb. 2015 to Sept. 2015.Twenty four cows (average weight of 557.3 kg at 3-5th lactating months, 2-6th lactation cycles and milk yield of 22.13kg/cow/day)were allocated to a completely randomized design with 4 groups, each group withsix replications.The controlgroup received nosupplementation cotton seed oilbutbasaldietand the experimental groups, apart from basal diet, were supplemented cotton seed oil with 1.5% (KP1,5); 3.0% (KP3,0) and 4.5% (KP4,5). Thebasal diet included cornsilage, TRM feed and elephant grass (ad libitum). Results showed that the DM intake increased by 3.39- 6.82%, and ME intake increased by 6.25-14.43%in the groups fed cotton seed oil compared to the control group. Cotton seed oil supplements had no effect on DM digestibility at 1.5% but significantly reduced digestibility at the levels of 3.0-4.5%. The animals fed cotton seed oil supplements increased milk yield by 5.4-12.2% and reduced methane emission intensity calculated as L/kg FCM by 18,8- 37,9 (P> 0.05). As a result, the supplementation of cotton seed oil at 1.5-3,0% in the diet improved animal performance and environment efficiency.

• Preliminary Records of Fish Faunna Species of Perciformes Order in Lower Saigon - DongnaiRiver System

  Nguyen Xuan Dong, Kien Thai Bich Nga

  Date Received: 03-07-2014 / Date Accepted: 13-08-2014

   Abstract PDF (VIETNAMESE)

  A study was carried out from December 2009 to December 2013. About 300 specimens was collected in lower Saigon - Dongnai river system. The resultsshowed that 81 species belongingto 56 genera, 32 families wererecognized and classified. Gobid family (Gobiidae) wasthe most diverse group, with 16 species (19.75% of the total). Croakers (Sciaenidae) and Gouramies family (Osphronemidae) were the second-most diverse group, consisting of6 species and account for 7.14%. The Sleepers family (Eleotridae) consistedof 6 species and accountedfor 6.17%. Other families consisted1-4 species, accountingfor 1.23 –4.94%. In the total of species classified, there were 38 migratory species, 35 economy valuable fish species, 2 species which are in Vietnam red list (2007, VU-Vulnerable).

• 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.