Ảnh hưởng các nguồn xơ trung tính đến sự sinh khí mêtan và khí carbonic ở in vitro

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Tác giả: Bình Trường Nguyễn, Văn Thu Nguyễn

Ngôn ngữ: Vie

Ký hiệu phân loại: 636.0852 Animal husbandry

Thông tin xuất bản: Khoa học kỹ thuật chăn nuôi 2021

Mô tả vật lý: 27-37

Bộ sưu tập: Metadata

ID: 411434

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Nghiên cứu này bao gồm 2 thí nghiệm (TN) nhằm xác định ảnh hưởng của các nguồn xơ trung tính đến hàm lượng dưỡng chất, khả năng tiêu hóa, sự sản sinh khí mêtan và carbonic trong điều kiện in vitro được bố' trí hoàn toàn ngẫu nhiên với 5 nghiệm thức (NT) và 3 lần lặp lại, sử dụng ống tiêm thủy tinh có thể tích 50ml theo phương pháp của Menke và ctv (1979): TN1 gồm vỏ cam, bã khoai mì, thân cây chuôi, cỏ đậu lá lớn, cỏ Paspalum (Paspalum aratum) TN2 gồm vỏ chanh, vỏ cam, cùi bắp, cỏ đậu lá lớn, cỏ Paspalum. Kết quả cho thây ở TN1, lượng khí CH4 sinh ra tại thời điểm 72 giờ ở in vitro của các NT giảm dần từ vỏ cam (72,6 ml/g), cỏ Paspalum (69,0 ml/g), bã khoai mì (55,4 ml/g), cỏ đậu lá lớn (52,8 ml/g) và thân cây chuối (44,9 ml/g). Tỷ lệ tiêu hóa chất hữu cơ (OMD) thắp ở cỏ Paspalum (60,4%) và cao nhất là vỏ cam (95,6%). Ở TN2, thể tích khí CH4 sinh ra tại thời điểm 72 giờ giảm dần từ cỏ Paspalum (88,9 ml/g), cùi bắp (77,9 ml/g), vỏ chanh (76,8 ml/g), vỏ cam (71,0 ml/g) và cỏ đậu lá lớn (68,4 ml/g). Tỷ lệ tiêu hóa chất hữu cơ (%) giảm dần theo thứ tự vỏ cam (95,7%), vỏ chanh (93,4%), cỏ đậu lá lớn (75,6 %), cùi bắp (69,0 %) và cỏ Paspalum (51,2 %). Qua 2 TN cho phép phân tích hồi quy tuyến tính đa biến ảnh hưởng của các dưỡng chất đến lượng khí thải CH4 và kết luận là các nguồn NDF từ thức ăn thô có ảnh hưởng khác nhau đến sự sản sinh khí CH4 và nó chịu tác động lớn hơn đối với các dưỡng chất là NFC hoặc NFE, kế đến theo thứ tự là NDF, ADF, CP và EE. Để nghị là tiến hành TN với số mẫu lớn hơn để khẳng định kết quả và có thể ứng dụng trong xây dựng khẩu phần cho gia súc nhai lại giảm khí thải mêtan. , Tóm tắt tiếng anh, A study including two experiments (Exp), was conducted at CanTho University to measure organic matter digestibility and gas production of neutral detergent fiber (NDF). The Exp 1 and 2 were a completely randomized design with 5 treatments and 3 replications. The treatment of Exp 1 were orange peel, cassava pulp, banana trunk, Mucana pruriens, Paspalum grass (Paspalum atratum). The treatment of Exp 2 were lemon and orange peels, corn cob, banana trunk, Mucana pruriens and Paspalum atraium. The results the Exp 1 showed that the methane (CH4) at 72h of orange peel treatment was significantly highest than Paspalum atratum, cassava pulp, Mucana pruriens and banana trunk (72.6 vs 69.0, 55.4, 52.8 and 44.9 ml/gDOM, respectively). The organic matter digestibility (OMD) of Paspalum atratum treatment was about 60.4% and orange peel about 95.6%. The results the Exp 2 showed that the CH4 of Paspalum atratum treatment was 88.9 ml/gDOM at 72h. It was significantly several (P<
0.05) with corn cob, lemon peel, orange peel and Mucana pruriens for 77.9, 76.8, 71.0 and 68.4, respectively. The OMD of experimental 2 was significantly various (P<
0.05) among treatments with the highest value for the orange peel treatment (95.7%) and the lowest value for the Paspalum atratum treatment (51.2%). In short, the neutral detergent fiber sources from fiber feeds were variably effect to CH4 production and NFC or NFE was more influent than NDF for CH4 production, then ADF, CP and EE were followed.

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