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Author: Maiti, Abhinaba × End date: 2021 × Start date: 2021 × Type: Thesis × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    Comparative studies on hematology, milk composition and udder morphology of lactating Sahiwal and crossbred cattle
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-09) Maiti, Abhinaba; Huozha, R.
    The current study has been undertaken to investigate various hematological entities, milk composition and udder morphology between healthy lactating Sahiwal and crossbred cattle. Total twenty healthy Sahiwal and crossbred cattle of 2nd to 3th parity were selected from the University Instructional Dairy Farm for this present study. Selected animals were kept as normal lactating animals in the farm where both blood and milk samples were collected once and followed their lactation stages as early (5-90 days), mid (91-180 days) and late (181-270 days). Among hematological entities Hb, PCV, TLC, erythrocytic indices, and both DLC (neutrophil, lymphocyte) and ALC (eosinophil) differ significantly during different stages of lactation in both the breeds. Comparing between two breeds during lactation Hb, PCV, TEC, TLC, DLC (lymphocyte, monocyte) and ALC (lymphocyte) were significantly different. Milk quantity as TDMY during different lactation stages found non-significant in Sahiwal, but in crossbreed cattle showed significantly higher during early lactation stage and overall mean than Sahiwal cattle. Among milk composition fat% and total solid% varies significantly during different lactation stages in both the breeds. While SNF%, protein% and lactose% varied significantly during lactation stages in Sahiwal cattle. No significant difference observed between two breed comparisons except in fat% and total solid%. Milk SCC also varied significantly during different stages of lactation in both the cattle breed. Crossbreed cattle had significantly higher SCC than Sahiwal. Among milk somatic cells, neutrophil% and lymphocyte% changed significantly during lactation stages in both the breed as well as between two breeds. Udder morphology had shown significant effect on milk SCC, milk neutrophils and TDMY but non-significant effect on milk composition. Round shaped udder and cylindrical shaped teat was found having higher milk SCC among others and trough shaped udder and conical shaped teat had least milk SCC in both the breeds. Correlation study between udder measurements with milk SCC showed that height from the ground to teat apex, teat diameter, average teat length are significantly correlated with milk SCC. Overall comparison between lactating Sahiwal and crossbred cattle with respect to effect of lactation stages indicated that indigenous Sahiwal cattle having better erythrocyte entities, blood DLC, and milk SCC and DLC with superior milk quality though TDMY was much lesser than crossbreed cattle. Thus, concluded that different stages of lactation highly affected the normal physiological state in both the breed and milk SCC changes according to lactation stages, udder and teat morphology.