This trial was conducted to determine the effects of dietary energy and protein levels on nutrient digestion, milk yield and serum biochemical parameters of lactating ewes (1 to 60 days in lactation) and weight gain of their lambs of Laiwu black goats. The levels of energy and protein in diets were formulated according to Feeding Standard of Meat-Producing Sheep and Goats (NY/T 816—2004). Digestive energy and crude protein levels were 12.78 MJ/kg and 15.00% at 1 to 30 days in lactation, respectively, and were 13.00 MJ/kg and 17.00% at 31 to 60 days in lactation, respectively. The high and low levels were 120% and 100% of the standards. Forty parturient ewes of Laiwu black goats were allocated to 4 groups, and ewes in different groups were fed diets with high protein-high energy (group A), low protein-high energy (group B), high protein-low energy (group C), and low protein-low energy (group D), respectively. The results showed as follows: 1) average daily gain of lambs in group A was significantly higher than that in the other groups (P<0.05), and weight loss of ewes appeared in group D with a narrow range. Weight gain speed of lambs at 1 to 30 days of age was higher than that at 31 to 60 days of age. Group C had the highest average daily gain of lambs at 1 to 30 days of age, and group A had the highest value at 31 to 60 days of age. 2) During the whole lactating period, total milk yield of ewes in groups A and C was significantly higher than that in groups B and D (P<0.05), lactating peak appeared at 30 days in lactation and then reduced gradually. 3) Both milk yield of ewes and average daily gain of lambs were affected by dietary protein level, while the effects of dietary energy level was not as obvious as that of dietary protein level. 4)Crude protein intake and milk production of ewes, and average daily gain of lambs had similar changing tends, and there might be some correlation among them. In conclusion, the appropriate dietary levels of digestive energy, crude protein and dry matter are 1.145 MJ/(kg W0.75·d), 17.67 g/(kg W0.75·d) and 93.73 g/(kg W0.75·d) at 1 to 30 days in lactation, and are 1.139 MJ/(kg W0.75·d), 19.65 g/(kg W0.75·d) and 90.14 g/(kg W0.75·d) at 31 to 60 days in lactation.
CHENG Guangmin
,
XU Xiangting
,
CHEN Fengmei
,
ZHANG Yongcui
,
LIU Jiansheng
,
WANG Jianmin
. Dietary Energy and Protein Levels Affect Nutrient Digestion, Milk Yield and Serum Biochemical Parameters of Lactating Ewes and Weight Gain of Lambs of Laiwu Black Goats[J]. Chinese Journal of Animal Nutrition, 2015
, 27(1)
: 281
-288
.
DOI: 10.3969/j.issn.1006-267x.2015.01.034
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