Milk Production, Blood Metabolites and Circulatory Levels of Hormones in Crossbred Goats

Abstract

Collection and analysis of milk and blood samplesAt fortnightly intervals (periods), milk samples were collected from individual goat throughout the experimental period of 150 days duration. Aliquots of milk in proportion to yield from each milking of individual goat were composited for analysis of milk constituents. In milk samples, fat was determined volumetrically by Gerber's method (I.S.I. 1958), protein by the method of Singhal and Des Raj (1989) and lactose by picric acid method (Perry and Doon, 1950). At 8:00 AM, jugular blood samples were collected in heparinized vacutainer tubes at fortnightly intervals from each goat. The blood samples were centrifuged and plasma was stored frozen in a freezer (-21°C) till analysis. For glucose estimation blood samples were collected in the tubes containing sodium fluoride and were immediately transferred into ice bucket. Blood glucose was estimated by Nelson-Somogyi method as described by

Effects of Two Different Energy Sources in Total Mixed Diets on the Performances and Blood Metabolites of Lactating Boerka Goats

“…The blood glucose concentrations were consistent with feed intake for all treatments. These levels are consistent with Singh & Ludri (2002) reporting the blood glucose level in 30, 60 and 90 lactation periods between 49-57 mg/dl. Range of glucose levels of 60 to 71 mg/dl in several breeds of the goat during lacatatin maintained under intensive production system was reported by Mohammed et al (2016).…”

Studies on Milk Yield, Milk Composition, Circulating Hormones, Energy Metabolites and Biochemical Parameters during Complete Lactation in Sahiwal Cows

“…From day 77 onwards the values continuously increased up to day 203 and thereafter day 217 from fluctuation was noticed up to end of lactation. Similar findings were observed by Singh and Ludri (2002) and ) who noted that higher value during early stage of lactation. However, contrary finding were recorded by Dalvi et al, (1995) who reported low T 3 concentration before parturition and followed by subsequent increase on day of parturition and declined after calving.…”

“…The levels of GH was initially high and then declined up to day 63 and then slightly increases up to day 133 and again slight declined up to day 203 and then increase day 217 and thereafter pattern was declined up to the end of lactation. Similar finding of higher value during early stage of lactation were observed by Jindal and Ludri (1990 a ), Singh and Ludri (2002) and ).…”

“…The pattern was showed increasing level up to day 91 and then there was slight decreases up to day 245 and then increases up to end of lactation. Similar findings of higher value during early stage of lactation were observed by Jindal and Ludri (1994), Jindal and Ludri (1990 b ) and Singh and Ludri (2002).…”

“…The nutrient requirements in late pregnancy, and particularly the nutrient demand for lactation, call for a coordination of the biological processes in different tissues resulting in metabolic changes that try to ensure that the cow's genetic potential for milk yield is exploited concurrently with maintenance of the homeostasis physiological parameters (Ingvartsen, 2006). After parturition, the maintenance of lactation is regulated by the number of hormones like GH, Insulin, Prolactin, T 4 and T 3 , which not only affect circulatory levels of blood metabolites but also the yield and composition of milk in cattle, buffaloes and goats (Jindal and Ludri, 1994;Singh and Ludri, 2002).…”