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   <subfield code="a">Ảnh hưởng của độ tuổi và việc bổ sung các mức độ kẽm và mangan vào khẩu phần thức ăn lên năng suất và chất lượng trứng gà Hisex Brown :</subfield>
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   <subfield code="b">Luận văn Thạc sĩ khoa học Nông nghiệp. Chuyên ngành Chăn nuôi</subfield>
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   <subfield code="c">2015</subfield>
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   <subfield code="a">Đề tài đánh giá ảnh hưởng của độ tuổi và việc bổ sung các mức độ Zn và Mn khác nhau lên tỷ lệ đẻ, tỷ lệ trứng bể, tiêu tốn thức ăn, độ dầy võ trứng và các chỉ số về chất lượng trứng gà.</subfield>
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   <subfield code="a">Trung tâm Học liệu Trường Đại học Cần Thơ</subfield>
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