China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (4): 1222-1228.doi: 10.16431/j.cnki.1671-7236.2021.04.009

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Evaluation and Comparative Analysis of the Nutritional Value of Potato Pulp and Sweet Potato Pulp in Part of Northern China

SONG Qiuhong, MENG Qingxiang, WU Hao, YI Simeng, ZHOU Zhenming   

  1. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Revised:2020-11-03 Online:2021-04-20 Published:2021-04-16

Abstract: The methods of chemical composition analysis,carbohydrate fractions analysis,protein fractions analysis,energy value prediction and in vitro artificial rumen were used to evaluate the nutritional values of potato pulp and sweet potato pulp.5 potato pulp samples were collected from starch factories in Chengde,Zhangjiakou,Jilin,Ulanchabu and Xi' an.7 sweet potato pulp samples were collected from starch factories in Shijiazhuang,Baoding,Tangshan,Jinan and Qinhuangdao.The results showed that EE content (0.80%) of sweet potato pulp was significantly higher than that of potato pulp (0.58%) (P<0.05).The content of CP,NDF,ADF and ADL of potato pulp (6.53%,26.03%,20.77% and 4.38%) were extremely significantly higher than that of sweet potato pulp (4.57%,16.46%,12.66% and 1.51%) (P<0.01).The starch content of potato pulp and sweet potato pulp were both higher,which were 41.05% and 41.71% respectively (P>0.05).The CC content of potato pulp (9.76%) was extremely significantly higher than that of sweet potato pulp (3.67%)(P<0.01).The PA content of potato pulp and sweet potato pulp were the highest in protein fractions,which were 2.77% and 2.41% respectively (P>0.05).The content of PB2 of potato pulp (1.39%) was significantly higher than sweet potato pulp (0.74%)(P<0.05).The content of PB3 and PC of potato pulp (0.56% and 1.01%) were extremely significantly higher than that of sweet potato pulp (0.28% and 0.47%) (P<0.01).TDN,DE,ME,NEm,NEL and NEg of sweet potato pulp (81.58%,15.03,13.31,9.09,8.50 and 6.24 MJ/kg) were extremely significantly higher than potato pulp (75.11%,13.82,12.10,8.08,7.66 and 5.40 MJ/kg)(P<0.01).DMD24 h and DMD48 h of sweet potato pulp (53.78% and 62.48%) were extremely significantly higher than potato pulp (49.34% and 58.66%) (P<0.01).In conclusion,the nutritional values of potato pulp and sweet potato pulp were both higher,and had the potential to become a feed material for beef cattle,and sweet potato pulp was better than potato pulp.

Key words: potato pulp; sweet potato pulp; nutrient composition; energy value; carbohydrate and protein fractions; in vitro digestibility

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