Ảnh hưởng bổ sung methionine thoát qua dạ cỏ lên thể trạng, năng suất và chất lượng sữa của bò sữa

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Tác giả: Thúc Nhật Hà, Kiên Cường Nguyễn, Thanh Hậu Nguyễn, Văn Chánh Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học kỹ thuật Thú y, 2023

Mô tả vật lý: tr.72

Bộ sưu tập: Metadata

ID: 342013

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu được thực hiện nhằm đánh giá hiệu quả của việc bổ sung methionine thoát qua dạ cỏ lên thể trạng, năng suất và chất lượng sữa. Thí nghiệm được bố trí trên 40 bò sữa rạ Holstein Friesian, được chia thành 2 lô (đối chứng và thí nghiệm) đồng đều về lứa đẻ, điểm thể trạng và năng suấtsữa. Bò ở lô đối chứng ăn khẩu phần cơ bản và bò lô thí nghiệm ăn khẩu phần cơ bản có bổ sung RPM ở mức 7 g/con/ngày từ 30 ngày trước khi sinh đến khi sinh và ở mức 10 g/con/ngày từ ngày cho sữa thứ 1 đến ngày thứ 100. Kết quả nghiên cứu cho thấy sản lượng sữa trung bình trong 100 ngày sau sinh (lít/con/ngày) là 29,20±0,81/26,86±0,98 (p <
0,05 )
tỷ lệ vật chất khô (%)là 12,67±0,26/11,97±0,30 (p<
0,001)
tỷ lệ chất béo trong sữa (%) là 3,86±0,24/3,33±3,30 (p<
0,001
tỷ lệ đạm trong sữa (%) là 3,56±0,15/3,28±0,14 (p<
0,05)
tỷ lệ lactose trong sữa (%) là 4,47±0,14/4,41±0,16 (p<
0,05)
số lượng tế bào soma trong sữa (tế bào/ml) là 447.586±415.328/703.150±498.381(p<
0,05) và chỉ số xê tôn huyết (mmol/L) 0,72±0,35/1,20±0,56 (p>
0, 01). Bổ sung RPM không làm ảnh hưởng đến thể trạng của bò trong suốt 100 ngày sau sinh. Chất bổ sung này giúp cải thiện sản lượng sữa, nhất là giai đoạn đỉnh sữa, tăng tỷ lệvật chất khô, tỷ lệ béo và đạm, nhưng không ảnh hưởng chất lượng sữa đầu, tỷ lệ lactose và nồng độ tế bào soma trong sữa. Ngoài ra, chất bổ sung này giúp làm giảm tỷ lệ bệnh xê tôn huyết.The study was carried out to evaluate the effect of supplementing methionine to the physical condition, milk productivity and quality of the milk cows. The experiment was arranged with 40 Holstein Friesian dairy cows, divided into 2 treatments (control and RPM treatment) with the same parity, body condition score and milk yield. The cows in control group were fed with the basic diet and the cows in RPM group were fed with basic diet and supplementing RPM at 7 g/cow/day from 30 days before calving to postpartum and at 10 g/cow/day from lactation day 1 to 100. The studied results showed that the average milk yield in 100 days postpartum (liters/head/day): 29.20±0.81/26.86±0.98
dry matter ratio (%): 12.67±0.26/11.97±0.30
milk fat percentage (%): 3.86±0.24/3.33±3.30
proportion of protein in milk (%): 3.56±0.15/3.28±0.14
proportion of lactose in milk (%): 4.47±0.14/4.41±0.16
quantity milk somatic cells (cells/ml): 447,586±415,328/703,150±498,381 and serum ketones (mmol/L): 0.72±0.35/1.20±0.56.Supplementing RPM into the diet did not affect the body condition during 100 days postpartum. However, this supplement improved milk production, especially during the peak milk period, increase the percentage of dry matter, fat and protein, but did not affect colostrum quality, percentage lactose and somatic cell concentration in milk. In addition, this supplement helps to reduce the incidence of ketosis.

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