Please use this identifier to cite or link to this item: http://prr.hec.gov.pk/jspui/handle/123456789/19771
Title: Fattening and Growth Performance of Ruminant Calves and Kids Under the Influence of Recombinant Bovine Somatotropin (rbST)
Authors: Nawaz, Muhammad
Keywords: Agriculture and Veterinary Sciences
Parasitology Veterinary
Issue Date: 2017
Publisher: Sindh Agriculture University, Tandojam.
Abstract: TITLE: Fattening and growth performance of ruminant calves and kids under the influence of recombinant bovine somatotropin (rbST). The present study was carried out on Kundhi buffalos calves (N=16, 16±2 wks of age), Thari cow calves (N=16, 16±2 wks of age) and Kamori goat kids (N=16, 6±1 wks of age) at Livestock Experiment Station (LES), Sindh Agriculture University Tandojam. At the commencement of experiment the cow calves, buffalo calves and kids weighed on average 44.57±0.63, 64.48±0.57 and 14.61±0.27 kg respectively. Animals were fed total mixed ration (TMR) as a basal diet composed of roughages and concentrates with the ratio of 60:40. Animals were fed adlibitum twice a day at 0800 and 1700 clock. Animals of each species were divided into two groups, viz. control and rbST with 8 animals per group. The animals in rbST group received subcutaneous injection of rbST fortnightly, at the dose rate of 1 mg/kg.BW and those in C were kept as control. The experiment lasted upto 36 weeks for cow and buffalo calves and 22 weeks for kids. Blood and fecal samples were taken on week 10 and 22 from goats and on week 18 and 36 from cow and buffalo calves, respectively. Serum biochemical concentrations such as total protein, total lipids and glucose, and serum hormones such as insulin-like growth factor (IGF-1), T3 and T4 concentrations were determined by using commercial kits. Meat samples were collected from longissimus dorsi (LD) muscle of slaughtered animals to determine the physico-chemical characteristics. The results revealed that the average body weight (BW), average daily weight gain (ADG), feed intake and dry matter intake (DMI) in cow and buffalo calves and in kids increased (P < 0.05) in rbST group compared with control. The digestibilities of dry matter (DM) and crude protein (CP) in cow and buffalo calves and in kids increased (P < 0.05) in rbST treated group compared to their controls. The hematological analysis of blood sampled on week 10th in kids and on week 18th in calves showed an increase (P < 0.05) in red blood cells and hemoglobin concentrations in rbST treated animals compared to control, however, the analysis of blood samples collected on week 22nd in kids and on week 36th in calves showed no difference (P > 0.05) in hematological parameters of animals between two groups. The analysis of serum samples taken on week 18 in calves and on week 10 in kids showed that the total protein and glucose concentrations increased (P < 0.05) and the total lipid and cholesterol concentrations decreased in rbST group than that of control, However, no significant changes (P > 0.05) were found between the rbST and control groups in all the examined biochemical variables on week 22 and 36 in kids and calves, respectively. Assessment of the minerals at week 36 in calves and at week 22 in kids showed that the serum Ca and Cu concentrations increased (P < 0.05) by 32.24%, 21.89% and 37.03% and by 28.21%, 24.28% and 30.96% in cow calves, buffalo calves and kids respectively. There was also an increase in T3 concentration in calves of rbST group compared with control on week 18 but did not differ (P > 0.05) on week 36. Similarly, in kids the significant increase (P < 0.05) in serum T3 concentrations were observed in the blood samples taken on week 10 of the rbST treatment, however, no difference (P > 0.05) in serum T3 concentrations were seen in the blood samples taken at week 22 of the experiment. The serum T4 concentrations were not different (P > 0.05) between the groups of cow and buffalo calves and kids throughout the experiment. Analysis of blood sampled on week 18 and 36 of rbST treatment showed that the serum IGF-I concentrations increased in cow and buffalo calves compared with control. Similarly, the analysis of blood sampled on week 10 and 22 of experiment showed that the serum IGF-I concentrations increased in goats of rbST group than that of control. The physical characteristics of meat samples showed no significant differences (P > 0.05) between the groups; however, among chemical characteristics of meat taken on week 18 from cow and buffalo calves and on week 10 from kids showed the increase (P < 0.05) in the moisture and CP by 9.91%, 11.1% 4.95% and 15.12%, 18.22% and 10.82%, and the fat content decreased (P < 0.05) by 22.85%, 26.61% and 23.73% in meat of cow calves, buffalo calves and kids, respectively. In conclusion, the treatment of young ruminants with rbST increased growth performance, enhanced digestibility of DM and CP and improved some chemical properties of meat. The rbST treatment stimulated eryhthropoises (increased production of RBC) and increased IGF-I and T3 concentrations in serum sampled on week 18 and 10 in calves and kids respectively. Though the serum IGF-I concentrations was higher but the erythropoietic effect and elevation in serum T3 concentrations were not found in the serum of calves and kids sampled on weeks 36 and 22 of the experiment. The data therefore suggests that the rbST induced-growth of young ruminants may partly be associated with both IGF-I and T3 at the early stage and with IGF-I only at the later stage of growth.
Gov't Doc #: 25209
URI: http://prr.hec.gov.pk/jspui/handle/123456789/19771
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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