Evaluation of Net Energy Requirement of Tianfu Meat Ducks Aged from 2 to 3 Weeks

YU Lexiao; JIA Gang; ZHAO Hua; CHEN Xiaoling; LIU Guangmang; LI Hua; WANG Kangning

doi:10.3969/j.issn.1006-267x.2015.11.010

Chinese Journal of Animal Nutrition >

2015 , Vol. 27 >Issue 11: 3391 - 3401

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.11.010

POULTRY NUTRITION

Evaluation of Net Energy Requirement of Tianfu Meat Ducks Aged from 2 to 3 Weeks

YU Lexiao ,
JIA Gang ,
ZHAO Hua ,
CHEN Xiaoling ,
LIU Guangmang ,
LI Hua ,
WANG Kangning

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Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2015-05-17

Online published: 2015-11-21

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Abstract

The objective of this study was to determine the net energy (NE) requirement of Tianfu meat ducks aged from 2 to 3 weeks old. A total of 300 seven-day-old Tianfu meat ducks were selected for the experiment. To determine the apparent metabolizable energy (AME) of diets at different feeding levels, fifty ducks were selected and randomly distributed into five feeding levels consisting of ad libitum and 15%, 25%, 35%, 45% restriction groups. The remaining 250 ducks were used for the feeding experiment and comparative slaughter experiment. At the beginning of the experiment, ten ducks were selected and slaughtered to determine the initial body composition. The remaining ducks were randomly distributed into five feeding treatments (same as the metabolic experiment). At the age of 14 days, ten ducks were selected from the ad libitum group and slaughtered to determine the body composition; at the age of 21 days, ten ducks were selected from every treatment and slaughtered to determine the final body composition. Based on the data of AME of diets, growth performance and body composition of ducks of the ad libitum group and restriction groups, heat production (HP) and metabolizable energy intake (MEI) at different feeding levels were obtained. NE for maintenance (NE_m) was estimated as the antilog of the intercept of the linear regression between MEI and log₁₀HP. NE for weight gain (NE_g) was estimated based on the total body energy (BE) and body weight (BW) of ducks of the ad libitum group at different ages. The result showed as follows:there were significant differences of AME of diets, average daily feed intake (ADFI), average daily gain (ADG), feed to gain (F/G), body fat content, body protein content, body water content, body energy content, energy retained as fat (RE_f), energy retained as protein (RE_p), MEI, body energy retention (RE), and HP at different feeding levels (P<0.05). AME of diets, F/G, body protein content and body water content of restriction groups were significantly higher than those of the ad libitum group (P<0.05); while ADFI, ADG, body fat content, body energy content, RE_f, RE_p, MEI, RE and HP of restriction groups were significantly lower than those of the ad libitum group (P<0.05). The regression equation between MEI and log₁₀HP of ducks aged from 2 to 3 weeks was:log₁₀HP=2.76+0.000 1×MEI, and regression equation between BE and BW was:BE=-768.87+10.71×BW. It is concluded that the NE_m of Tianfu meat ducks aged from 2 to 3 weeks is 577.03 kJ/(kg BW^0.75·d), and the NE_g is 10.71 kJ/g, therefore, the NE requirement of Tianfu meat ducks aged from 2 to 3 weeks can be calculated by the following formula:NE=577.03BW^0.75+10.71△W.

Key words： Tianfu meat ducks; net energy; requirement; factorial method

Cite this article

YU Lexiao , JIA Gang , ZHAO Hua , CHEN Xiaoling , LIU Guangmang , LI Hua , WANG Kangning . Evaluation of Net Energy Requirement of Tianfu Meat Ducks Aged from 2 to 3 Weeks[J]. Chinese Journal of Animal Nutrition, 2015 , 27(11) : 3391 -3401 . DOI: 10.3969/j.issn.1006-267x.2015.11.010

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