Circadian Variations of Thermoregulation, Blood Constituents and Hormones in Crossbred Dairy Cows in Relation to Level of Milk Production
Journal Title: Journal of Veterinary Advances - Year 2014, Vol 4, Issue 4
Abstract
Physiological processes in cattle generally reveal a pattern of diurnal rhythmicity that could be influenced by various intrinsic and extrinsic factors. The objective of this study was to monitor the daily rhythms in thermoregulation and blood constituents and endocrine responses in crossbred cows (Butana x Friesian) in a tropical environment. Also it was intended to explore the effect of level of milk production of cows on the pattern of diurnal responses. The cows used in the investigations were six relatively high producing cows (14.30 kg/day) and six low producing cows (7.10 kg/day) during late lactation. The nycthemeral changes in physiological parameters were monitored at 6 hrs intervals for 48 hrs. The rectal temperature (Tr) and respiratory rate (RR) increased in the afternoon (12:00 PM) in both groups and high producing cows maintained higher values during the course of the study. The packed cell volume (PCV) and Hb concentration were higher in high producing cows compared to low producing cows. Serum levels of glucose, cholesterol and triglycerides showed a significant diurnal variation in both groups of cows. Serum urea concentration showed relative stability in both experimental groups. Serum levels of glucose, cholesterol, triglycerides and urea were lower in high producing cows than in low producing cows. Serum enzymes AST and ALT showed irregular diurnal variation in both high and low producing cows and high producing cows maintained lower aminotransferase enzyme activity. Serum cortisol level was higher at 12:00 PM and 6:00 PM compared to values measured in the morning (6:00 AM) and night (12:00 PM) and cortisol level was higher in high producing cows. Serum insulin level did not reveal significant diurnal variation in both groups of cows and insulin level was higher in high producing cows. The findings may be utilized in diagnosis of metabolic diseases and monitoring the production of dairy cows.
Authors and Affiliations
A. O. Alameen , A. M. Abdelatif , M. E. Elnageeb
Keywords
Related Articles
- EP ID EP110334
- DOI -
- Views 101
- Downloads 0
Prospective Study on Ano-Rectal Anomalies in Neonatal Farm Animals
The present study was carried out to clinically classify and assess the different conditions associated with ano-rectal anomalies in neonatal farm animals and to determine the outcome of surgically correction and surviva...
Risk Factors Associated with Impaction Colic in Horses at North Western Area of Libya
Colic is a serious clinical condition affecting the welfare and survival of horses at the studs worldwide. However little is known about the incidence or risk factors associated with this condition among different horse...
Relation of Variables Structure Dasometric with Foliage and Fruit Production in Tropical Tree Forage Legumes in Mexico
Were related variables dasometric structure with the production of foliage on trees Pithecellobium dulce (Roxb. Benth.), Gliricidia sepium (Kunth) and Haematoxylum brasiletto (H. Karst) and fruit production in P. dulce a...
Studies on Growth Kinetics of the FMDV Serotype SAT-2 Egyptian Strain in Cell Culture
Foot and mouth disease virus (FMDV) Type SAT-2/Egypt/2012 isolated from El-Gharbiya Governorate was propagated six serial passages into monolayer BHK21 cell line. Growth curve of the infected virus, development of comple...
Optimization of the Inactivation Process of FMD Virus Serotype SAT-2 by Binary Ethyleneimine (BEI)
Complete inactivation of FMDV new isolate type SAT2 Egypt 2012 at 37ºC using BEI with morality 0.1, 0.4, 0.8, 1.2 and 1.6 mM was obtained at 16,14, 10, 8 and 8 hours respectively, with inactivation rate ranged from 0.53...