| In this experiment,6 small-tailed Han sheep with a weight of 45.3±1.8 kg,about 3 years old,were selected as empty-bearing ewes.all fed with a coarse feed diet containing 65% of corn stalks,and they were free to eat and drink.Compare three different corn stalk rations processing.Or the treatment method(that is,using only 2/3 part of the corn stalks(2/3 straw)as coarse,adding polyacrylamide(PAM))and pelleting)will affect the free intake and digestion and metabolism of sheep to determine the energy Whether it is an effective method to improve the digestibility of corn stalk diets in sheep.The experiment adopted a 6×6 Latin square experiment design,divided into 6 treatments,namely treatment 1: whole corn stalk(whole straw);treatment 2: 2/3 straw;treatment 3: 2/3 straw + PAM;treatment 4: whole Straw +pellets;treatment 5: 2/3 straws + pellets;treatment 6: 2/3 straws + pellets + PAM.The mixed concentrate part of each treatment diet is the same,and the ratio of concentrate to coarse is the same.The PAM feeding amount is 2.44 g/kg diet(based on dry matter).There are six trials,each with a total of 24 days,of which the pre-trial period is 14 days and the official period is 8 days.Each treatment n=6.In the official period,the leftover material,feces and urine of each sheep were collected and weighed and recorded.Determine the content of dry matter,organic matter,crude protein,cellulose,hemicellulose,lignin,calcium,phosphorus and energy in the collected samples.The results showed that when fed with 2/3 crushed straw ration,the dry matter free intake,crude protein intake,apparent dry matter digestibility and nitrogen retention of sheep were 997.4±173.4 g/sheep/day and 140.6 ±12.1 g/sheep/day,58.5±2.2% and 7.5±1.6g/sheep/day,compared with the whole straw crushed diet,increased by 8.6%(P>0.05),15.1%(P<0.05),1.7%(P>0.05)and 26.4%(P<0.01);when feeding 2/3 straw pellets,they were 1881.1±233.0g/sheep/day,258.4±22.8g/sheep/day,51.3±1.7% and 12.7±1.9g/sheep/day,Compared with the whole straw pellet diet,it increased by 3.3%(P>0.05),11.9%(P>0.05),1.2%(P>0.05)and 23.7%(P<0.01).When PAM was added,the dry matter free intake,dry matter apparent digestibility and nitrogen retention of sheep fed with 2/3stalk crushed diet were 1140.6±126.6g/sheep/day,59.6±2.8% and 8.6±1.2g/sheep/day,which increased by 14.3%(P<0.05),1.9%(P>0.05)and 15.0%(P<0.05)respectively than when no PAM was added;They were 2128.3±227.7g/sheep/day,52.6±1.4% and 14.2±2.2g/sheep/day,Compared with the addition without PAM,it increased by 13.1%(P<0.05),2.5%(P>0.05)and 11.6%(P>0.05).When feeding pellets,sheep’s free intake of dry matter,apparent dry matter digestibility and nitrogen retention in the whole straw pellet diet were 1821.0±166.8g/sheep/day,50.7±1.9% and 10.3±1.5 g/sheep/day,compared with the crushed whole straw ration,increase by 98.4%(P<0.01),-11.8%(P<0.01)and 73.2%(P<0.01);in the 2/3straw pellet diet They were 1881.1±233.0g/sheep/day,51.3±1.7% and 12.7±1.9g/sheep/day,which increased by 88.6%(P<0.01),-12.3%(P<0.01)and 69.5%(P<0.01);in the 2/3 straw + PAM pellet diet,2128.3±227.7g/sheep/day,52.6±1.4% and 14.2±2.2g/sheep/day,and 2/3 straw + PAM crushed The diet ratio increased by 86.7%(P<0.01),-11.7%(P<0.01)and 64.5%(P<0.01).It is concluded from this experiment that using only 2/3 of the corn stalks,Either crushed or pelleted diets can increase sheep’s crude protein intake,apparent digestibility and retention;adding PAM(2.44g/ kg diet),Either crushed or pelleted diets can increase the free intake of dry matter in sheep and increase nitrogen retention;while making pellets can greatly increase the free intake of sheep and increase nitrogen retention,although The apparent digestibility has been reduced,but the digestion capacity has been significantly improved,which can still meet the metabolic needs;and feeding PAM in pelleting still has a further effect on sheep nutrition.The three methods of processing corn stalks diets have superimposed effects.Therefore,using only 2/3 of the corn stalks,adding PAM and making pellets are all effective methods to improve the utilization of corn stalk diets by sheep. |
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