A Study on Energy and Protein Maintenance Requirements of Yaks during Late Pregnancy

PAN Hao; NIE Zhaolong; WANG Tong; LIU Shujie; SUN Lu; YANG Qien; FENG Yuzhe; CUI Zhanhong

doi:10.3969/j.issn.1006-267x.2020.08.034

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 8: 3750 - 3759

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.08.034

A Study on Energy and Protein Maintenance Requirements of Yaks during Late Pregnancy

PAN Hao ,
NIE Zhaolong ,
WANG Tong ,
LIU Shujie ,
SUN Lu ,
YANG Qien ,
FENG Yuzhe ,
CUI Zhanhong

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1. Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Yak Engineering Technology Research Center in Qinghai Province, Qinghai Academy of Animal and Veterinary Sciences in Qinghai University, Xining 810016, China;
2. China Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810008, China

Received date: 2020-02-24

Online published: 2020-08-13

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Abstract

This experiment was conducted to study the energy and protein maintenance requirements of yak during late pregnancy, and the results were provided to supplement and perfect basic parameters of yak feeding standard. Fifteen healthy pregnancy yaks treated for estrus synchronization and natural service, and then randomly divided into 3 groups with 5 yaks in each group. The feeding levels of the 3 groups were ad libitum (AL group), 80% ad libitum intake (IR80 group) and 60% ad libitum intake (IR60 group), respectively. Three yaks were selected in each group to conduct the digestion and metabolism test and gas exchange test. Two periods of digestion and metabolism test in yaks were studied on 180 to 185 d and 210 to 215 d of pregnancy and two periods of gas exchange test in yaks were studied on 186 to 190 d and 216 to 220 d of pregnancy. The carbon metabolism indicators (carbon intake, fecal carbon, urinary carbon, methane carbon and carbon dioxide carbon), energy metabolism indicators (total energy intake, fecal energy, urine energy and methane energy) and nitrogen metabolism indicators[nitrogen intake (NI), fecal nitrogen, urine nitrogen] were measured to calculate nitrogen retention (NR), metabolic energy intake (MEI) and energy retention (ER). Through regression analysis, the net protein requirement and metabolic energy requirement for maintenance of yaks during late pregnancy could be calculated. The results showed as follows:the regression equations between NI[g/(kg W^0.75·d)] and NR[g/(kg W^0.75·d)] on the 180 and 210 d of pregnancy were NR=1.046_(±0.18)NI-0.600_(±0.09) and NR=1.065_(±0.15)NI-0.611_(±0.07), respectively. The ordinate intercept was the maintenance net nitrogen requirement of yaks, and the maintenance net protein requirement could be calculated by multiplying the factor 6.25. The regression equations between MEI[kJ/(kg W^0.75·d)] and ER[kJ/(kg W^0.75·d)] on the 180 and 210 d of pregnancy were ER=1.722_(±0.55)MEI-755.760_(±184.19) and ER=0.988_(±0.25)MEI-534.870_(±87.35), respectively. When ER=0, the value of MEI was the requirement of maintenance metabolic energy for yaks. From the above regression equations, we can conclude that the requirements of maintenance net protein for yaks on the 180 and 210 d of pregnancy are 3.75 and 3.82 g/(kg W^0.75·d), respectively, and the requirements of maintenance metabolic energy for yaks on the 180 and 210 d of pregnancy are 438.81 and 541.64 kJ/(kg W^0.75·d), respectively.

Key words： yaks; late pregnancy; energy; protein; maintenance requirement

Cite this article

PAN Hao , NIE Zhaolong , WANG Tong , LIU Shujie , SUN Lu , YANG Qien , FENG Yuzhe , CUI Zhanhong . A Study on Energy and Protein Maintenance Requirements of Yaks during Late Pregnancy[J]. Chinese Journal of Animal Nutrition, 2020 , 32(8) : 3750 -3759 . DOI: 10.3969/j.issn.1006-267x.2020.08.034

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