Elham Nadri; Fardin Hozhabri; Mohammad Mehdi Moeini
Volume 22, Issue 2 , June 2020, , Pages 223-235
Abstract
In order to evaluate the effect of cobalt on performance, some blood and ruminal fermentation parameters an experiment was performed using 24 three to four months old male lambs, with an average weight of 30 kg in a completely randomized design with four treatments and six replications. The ...
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In order to evaluate the effect of cobalt on performance, some blood and ruminal fermentation parameters an experiment was performed using 24 three to four months old male lambs, with an average weight of 30 kg in a completely randomized design with four treatments and six replications. The experimental treatments consisted of: basic diet (control; containing 0.083 mg cobalt /kg DM); basal diet + 0.2 mg Cobalt /kg DM, basal diet + 0.4 mg cobalt /kg DM, and basal diet + 0.6 mg / kg of cobalt. In order to determine blood parameters on days 0, 45, 70, blood samples were collected from jugular vein and ruminal fluid through the esophagus were taken to evaluate ruminal fermentation parameters. Cobalt supplement had no significant effect on daily gain, dry matter intake, feed conversion ratio, serum B12, cholesterol, triglyceride and albumin and also alkaline phosphatase and alanine transaminase. Ruminal ammonia concentration increased at the level of 0.2 and 0.4 (P<0.05), but concentration of volatile fatty acids, rumen pH and protozoan population did not influence. The concentrations of cobalt, iron, zinc and copper minerals were not affected by treatments. The results of the present study showed that adding cobalt supplementation to the diet up to the level of 0.6, despite limited changes in some blood and ruminal parameters did not have a significant effect on the performance of lambs; it seems that the cobalt in the basic diet could be sufficient for the cobalt requirements of growing Sanjabi lambs.
Seyed Amir Hossein Dezfoulian
Volume 20, Issue 1 , May 2018, , Pages 177-190
Abstract
To evaluate the effects of cobalt source and level on blood parameters and performance, 30 indigenous breed male goat kids of 3-5 months age, with an average BW of 17.8±2.5 kg were assigned to five treatments in a completely randomized design: 1) Basal diet containing 0.076 mg Co/kg DM (Control); ...
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To evaluate the effects of cobalt source and level on blood parameters and performance, 30 indigenous breed male goat kids of 3-5 months age, with an average BW of 17.8±2.5 kg were assigned to five treatments in a completely randomized design: 1) Basal diet containing 0.076 mg Co/kg DM (Control); 2) basal diet + 0.25 mg Co/kg DM as Co-sulphate (sulphate 0.25); 3) basal diet + 0.5 mg Co/kg DM as Co-sulphate (sulphate 0.5); 4) basal diet + 0.25 mg Co/kg DM as Co-glucoheptonate (glucoheptonate 0.25); 5) basal diet + 0.5 mg Co/kg DM as Co-glucoheptonate (glucoheptonate 0.5). Goat kids receiving 0.5 ppm of Co from glucoheptonate had higher DMI compared to control. Final body weight and average daily gain was affected by the level of Co supplement and was significantly higher in 0.5 ppm receiving treatments. However, feed conversion ration did not differ significantly between treatments and differences were only numerical. Cobalt supplements affected serum glucose and vitamin B12 and the highest difference was for glucoheptonate 0.5 treatment. Although the glucoheptonate 0.5 treatment differed significantly with control, there were no significant differences with other treatments. Cobalt treatments had no significant effect on serum biochemical and hematological parameters. In general, the level of cobalt had a significant effect on goat performance given that higher levels of cobalt caused greater dry matter intake and average daily gain. The results of the present study showed that the requirement level of 0.07 mg/d for goats is marginally adequate and the organic Co source performed better in the rumen for vitamin B12 synthesis and consequently glucoseand goat performance was better at 0.5 as compared to 0.25mg Co/Kg DM.