The chemical composition of sugarcane press mud, concentrate mixture and wheat straw are presented in Table 2. The crude protein content of sugarcane press mud (15.08%) was slightly higher than the earlier values reported by Suresh and Reddy (2011) and Suma et al., (2007) i.e.11.8 and 12.76%, respectively but lower than that reported by Ankita, (2013) and Ranjan Kumar (2015) where the values ranges from 15.55 to 18.1%. The total ash (TA) content of sugarcane press mud (19.67%) was lower than values reported by Suresh and Reddy (2011) and Suma et al., (2007). The neutral detergent fibre (63.56%) and acid detergent fibre content (32.8%) of sugarcane press mud was lower than the values reported by Gupta and Ahuja (1998). From the proximate analysis, it is evident that the composition of sugarcane press mud (SPM) is similar with that of certain cereal by-products like wheat bran as far as protein and crude fibre contents are concerned. Variations in the proximate composition of sugarcane press mud can be attributed to quality of sugarcane and composition of soil in which it was grown.
The overall dry matter through concentrate mixture was significantly (P<0.05) lower in T
3 (1179.3) group as compared to T
1 (1504.6) and T2 (1504.5) groups, whereas wheat straw was statically similar in all the groups (Table 3), which was in accordance with results of
Helal et al., (2011), who also reported reduced dry matter intake in calves fed 70 and 85% restricted diets of the concentrate mixture as compared to fed ad libitum TMR. The overall daily dry matter intake did not differ significantly among all the groups. The results of present study are in agreement with
Ankita (2013) who reported comparable intake of concentrate, roughage and total dry matter in kids fed SPM @ 0, 10 and 20% SPM in concentrate mixture. The observations of present study suggest that inclusion of sugarcane press mud (SPM) in the concentrate mixture up to 20% level did not affect its palatability as there was no adverse effect on the dry matter intake of experimental calves.
Results of haematological parameters in different groups of calves were presented in Table 4. Non-significant difference was observed in concentration of Hb (g/dl), PCV (%) and count of WBC and RBC levels of experimental calves irrespective of dietary treatments and periods. Results were supported by
Malapure (2015) who reported comparable serum Hb and PCV levels in calves fed SPM at 0, 10 and 20% level in concentrate mixture. Similar findings were also reported by
Ankita (2013) in kids fed SPM at 0, 10 and 20% level in the concentrate mixture. The result reveals that feeding of SPM up to 20% level in concentrate mixture has no adverse effect on haematological parameters of crossbred calves.
Table 5 shows the serum biochemical parameters in different groups. Serum glucose, total proteins, albumin, globulin and A: G ratio were comparable among various dietary treatment groups. Blood glucose levels of all the experimental calves were within the normal physiological range
(Kaneko et al., 2008). The inclusion of SPM at 20% level in the concentrate mixture did not affect the blood glucose level, which indicated that the calves consuming the diets with SPM were in a normal energy status. Findings of present study was corroborated with that of
Malapure (2015), who also reported comparable serum glucose level in calves among the treatment groups fed 0, 10 and 20% SPM in the concentrate mixture. Concentrations of serum total protein, albumin, globulin and A:G ratio are in agreement with
Ranjan Kumar (2015),
Ankita (2013) and
Sahu (2014) who reported statistically similar levels of these parameters in lambs, kids and crossbred pigs fed SPM up to 20% level in respective concentrate mixtures. The comparable levels of serum total protein and its fractions between control and SPM fed groups are suggestive of adequacy of the protein available to the animals. The serum urea concentration was in normal physiological range
(Kaneko et al., 2008) in all experimental calves. Results are in agreement with
Malapure (2015) who reported no change in serum urea concentration of experimental calves fed SPM at 10 and 20% level in concentrate mixture when compared to control group (0% SPM in the concentrate mixture). Similar results were also reported in lambs by
Ranjan Kumar (2015) and in kids by
Ankita (2013).
The serum enzyme concentration was presented in Table 6. The alkaline phosphatase (ALP) in experimental calves was statistically similar irrespective of dietary treatments (T
1, T
2 and T
3). However, mean serum ALP concentration (IU/L) at 75 and 150 d was significantly (P<0.05) higher as compared to 0d. The mean serum concentrations of Aspartate aminotransferase (AST) and Alanine aminotransferase (ALT) of all the experimental calves under different dietary treatments were statistically similar irrespective of different dietary treatments and periods. The activity of ALT and AST was within normal physiological range
(Kaneko et al., 2008) which indicates normal liver function in all the crossbred calves. The observations regarding comparable activity of serum enzymes (ALP, AST and ALT) clearly indicate that feeding of sugarcane press mud (SPM) to experimental calves up to 20% level in growing stage has no harmful effect on liver, heart, skeletal muscles and other organs of the body.
The data pertaining to humoral immune response of crossbred calves against
Brucella abortus strain-19 (killed) is presented in Table 7. The antibody titre (log2) against
Brucella abortus strain-19 was statistically similar in all experimental calves over the entire duration in different groups (T
1, T
2 and T
3). Antibody titre was increased significantly (P<0.05) up to 21 d of post inoculation then started declining gradually in all the groups. Similarly,
Malapure (2015) also reported that there is no significant difference in humoral immune response among different treatment groups of calves fed different level of SPM in concentrate mixture. On the contrary
Ankita (2013) observed significantly (P<0.05) reduced humoral immune response in kids fed 20% SPM in the concentrate mixture than the kids offered no SPM in the concentrate mixture which is in contrary with the findings of present study.