Net Energy Requirement of Male Minks during Winter Fur-Growing Period

HAN Feifei; ZHONG Wei; ZHANG Xinyu; MU Linlin; CHEN Shuangshuang; WANG Zhuo; LIU Keyuan; LI Guangyu

doi:10.3969/j.issn.1006-267x.2020.12.054

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 12: 5994 - 6000

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.12.054

Net Energy Requirement of Male Minks during Winter Fur-Growing Period

HAN Feifei ,
ZHONG Wei ,
ZHANG Xinyu ,
MU Linlin ,
CHEN Shuangshuang ,
WANG Zhuo ,
LIU Keyuan ,
LI Guangyu

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State Key Laboratory of Special Economic Animal Molecular Biology, Institute of Economic Animal and Plant Science, Chinese Academy of Agriculture Sciences, Changchun 130112, China

Received date: 2020-04-30

Online published: 2020-12-07

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Abstract

This experiment adopted open circuit respiratory calorimetry with 6 chambers in parallel for fur animal to analyze and calculate the net energy (NE) requirement of male minks during winter fur-growing period, and to provide more accurate data reference for mink industry in China. Thirty heathy male minks with similar days of age and body weight were selected and fed an experimental diet, an adaptation period of 7 d was used to adapt the experimental diet and then respiratory calorimetry test was carried out. In the test, three phases were set up, and each of which lasted for 7 d. There were 3 replicates in each phase and 2 minks in each replicate. After weighing each phase, 6 minks were selected and each 2 minks were put into the respiration chambers. The gas exchange was measured in the metabolism chamber for 7 days. There were 1 d for adaptation, and 3 d for normal metabolism, and then 3 d for fasting metabolism. The results showed as followed: 1) the metabolizable energy intake (MEI) was 755.69 kJ/(kg BW^0.75·d), heat production(HP)was 526.31 kJ/(kg BW^0.75·d), net energy for growth (NE_g) was 229.00 kJ/(kg BW^0.75·d) during balance trail. Fasting heat production (FHP) was 489.75 kJ/(kg BW^0.75·d), the NE requirement was 718.75 kJ/(kg BW^0.75·d). 2) The O₂ consumption was 26.19 L/(kg BW^0.75·d), the CO₂ production was 21.26 L/(kg BW^0.75·d), and the respiratory quotient (RQ) was 0.82 during balance trail. The O₂ consumption was 24.63 L/(kg BW^0.75·d), the CO₂ production was 19.44 L/(kg BW^0.75·d), and RQ value was 0.79 during fast period. 3) The metabolizable energy for maintenance (ME_m) and net energy for maintenance (NE_m) requirement estimated from the linear relationship between retained energy (RE) and MEI were 519.80 and 493.20 kJ/(kg BW^0.75·d), respectively. The ME_m and NE_m estimated by logarithmic regression of HP on MEI were 514.00 and 474.24 kJ/(kg BW^0.75·d), respectively. In conclusion, the energy requirements of the male minks during the winter fur-growing period of 1.92 to 2.40 kg body weight are: ME_m 514.00 to 519.80 kJ/(kg BW^0.75·d), NE_m 474.24 to 493.20 kJ/(kg BW^0.75·d), NE_g 229.00 kJ/(kg BW^0.75·d), NE 718.75 kJ/(kg BW^0.75·d), respectively, and the K_m is 92.27% to 95.46%.

Key words： mink; winter fur-growing period; energy balance; respiratory metabolism; energy requirement

Cite this article

HAN Feifei , ZHONG Wei , ZHANG Xinyu , MU Linlin , CHEN Shuangshuang , WANG Zhuo , LIU Keyuan , LI Guangyu . Net Energy Requirement of Male Minks during Winter Fur-Growing Period[J]. Chinese Journal of Animal Nutrition, 2020 , 32(12) : 5994 -6000 . DOI: 10.3969/j.issn.1006-267x.2020.12.054

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