| This experiment was carried out to study the feeding behavior,weight gain and growth pattern and blood index of Mongolia cattle under natural grazing condition.The trial was conducted in October.Visual inspection was used for the observation of feeding behavior of cattle.Chest circumference,body weight and body length was measured by the measurement tape.Ambient temperature was recorded.Such as the biochemical analysis kit,gas chromatography technology was used to determine the content of blood antioxidants,blood fat metabolites and amin acids.The results are as follows:(1)During the trial period,feed intake of 1 year old cattle,2 year old cattle,and 5-year-old cattle in a food station was respectively 19.90 ± 2.99 times,16.10 ± 1.91 times,and 8.70 ± 2.00 times,and the differences were significant(P<0.05);the time for food intake was 18.00 ± 2.49s,15.50 ±2.36s,and 8.40 ± 2.06s,and the differences were significant(P<0.05);dry matter intake was 1.92 ± 0.14g,2.97 ± 0.34g,and 3.94 ± 0.55g,and the differences were significant(P<0.05);each dry matter intake content was 0.08 ± 0.11g,0.18 ± 0.38g,and 0.51 ± 0.12g,and the differences were significant(P<0.05);feed intake rate was 1.09 ± 0.13s/time,1.04 ± 0.11s/time,and 1.07 ± 0.16s/times,and the differences were not significant(P>0.05).In a feed station,the feed intake and the time for feed intake showed a decreasing trend with age,and dry matted intake and dry matter intake content showed an increasing trend with age,whereas the feed intake rate was no obvious change.(2)Under the condition of natural grazing,the body weight of 1-year-old Mongolia cattle increased from 109.5Kg to 120.8Kg.The relative weight gain was 11.3 kg and the average daily weight gain was 0.55Kg.The body weight of 2-year-old Mongolia cattle increased from 215.9Kg to 228.8Kg.The relative weight gain was 12.9Kg.The average daily weight gain was 0.64Kg.(3)The change of body length for Mongolia cattle showed an increasing trend with age.The body oblique length in before 2-year-old cattle showed obvious increased trend and at 2 ages it reached 90%of adult cattle,whereas the growth rate of it decreased after.From the curve of bust growth,it has be seen that bust growth curve increased from 1 to 6-year-old cattle,and bust growth rate was significant in 1 to 3-years-old cattle,and the bust increased from 129.9cm to 171.3cm,but since the age of 3 the growth rate slowed down that it increased from 129.9cm to 144.3cm.For the body weight change,the growth of bones and body size changed constantly,and the body weight reached a relatively smooth state at the age of 5,and the indicators of Mongolia cattle have reached the level of maturity.(4)Under the condition of natural grazing,the contents of blood antioxidant indexes(T-SOD,GSH-PX,T-AOC and MDA)of Mongolia cattle were respectively 84.10U/mL?198.01mU/mL,1.34U/mL and 5.67nmol/mL.The content of the related indexes of blood protein and lipid metabolism was 1.84mmol/L for TG,4.96 mmol/L for TC,1.29 mmol/L for LDL-C,2.37 mmol/L for HDL-C,937.58U/L for FAS,and 695.32U/mL for HSL.In the blood of Mongolia cattle,the content of lysine was the highest EAA with the value of 575.52mg/100mL,and the content of glutamic acid was highest in NEAA with the value of 883.65mg/100mL.The content of blood functional amino acid of-Mongolia cattle was 1574.63 mg/100mL,the content of sweet amino acids was 1002.09 mg/100mL,and the bitter amino acid content was 1426.15 mg/100mL. |
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