Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
3400
1
0
9 trang
Ruminants, such as dairy cows, can very well utilize NPN (see Chapter 2). Hence, instead of
feeding dairy cows expensive (true) protein, cheaper sources of nitrogen can be used as well.
Urea which is relatively cheap chemical product, is such a non-protein nitrogen. However,
certain precautionary rules must be observed when feeding non-protein nitrogen to dairy
cows. It should be realized, that NPN (urea) can only be used in low level production systems
with high amounts of poor quality roughage. In feeding high yielding dairy cows, this NPN
does not play a significant role. In case the ration is...
Nội dung trích xuất từ tài liệu:
UNIVERSITY DEPARTMENTS ANNA UNIVERSITY CHENNAI :: CHENNAI 600 025 REGULATIONS – 2008
