Comparative Studies of Lipid Metabolism in Zebu and British Cattle in a Tropical Environment. II. Blood Lipid Levels of Cattle on Different Diets

Jc, O'Kelly

doi:10.1071/bi9681025

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…The free cholesterol concentration was unaltered in the tick-free animals, so the reduction in total cholesterol resulted from a reduction in the cholesterol ester fraction with a consequent increase in the free : total cholesterol ratio. Such a dietary disturbance in the balance between these two forms of plasma cholesterol has been reported previously (O'Kelly 1968b). Tick infestation resulted in a decrease in the plasma concentrations of both free and esterified cholesterol, the increased free: total cholesterol ratio in the tick-infested animals was then due to a proportionally greater fall in the cholesterol ester fraction.…”

Section: (A) Experiments 1' Steers On Low-quality Feedsupporting

confidence: 69%

“…The inability of the tick-infested animals, in contrast to the tick-free animals, to elaborate greater amounts of serum albumin could possibly be explained by a lowered feed intake. This is unlikely, however, to account for the reduced amounts of plasma total cholesterol and phospholipid since the concentrations of these two lipids are not influenced by level of intake on high-quality lucerne hay diets (O'Kelly 1968b). For the same reason it is not likely that the increased free: total cholesterol ratio in the tick-infested animals would result from small changes in dietary intake.…”

Section: (B) Experiments 2: Steers On High-quality Feedmentioning

confidence: 99%

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The Effects of Tick (Boophilus Microplus) Infestations on the Blood Composition of Shorthorn X Hereford Cattle on High and Low Planes of Nutrition

O'Kelly¹,

Seifert²

1970

Aust. Jnl. Of Bio. Sci.

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Section: (A) Experiments 1' Steers On Low-quality Feedsupporting

confidence: 69%

Section: (B) Experiments 2: Steers On High-quality Feedmentioning

confidence: 99%

The Effects of Tick (Boophilus Microplus) Infestations on the Blood Composition of Shorthorn X Hereford Cattle on High and Low Planes of Nutrition

O'Kelly¹,

Seifert²

1970

Aust. Jnl. Of Bio. Sci.

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“…When nutritional supply is insufficient, the concentration of cholesterol decreases, and vice versa [30]. O’Kelly [31] reported that plasma cholesterol and triglyceride (TG) increased when high quality roughage (alfalfa hay) was fed. In the study by Campanile et al [32], the total cholesterol was higher in the high energy diet than the low energy diet, but there was no difference in the TG level.…”

Section: Resultsmentioning

confidence: 99%

Effects of reducing inclusion rate of roughages by changing roughage sources and concentrate types on intake, growth, rumen fermentation characteristics, and blood parameters of Hanwoo growing cattle (Bos Taurus coreanae)

Jeon

Jeong

Lee

et al. 2019

Asian-Australas J Anim Sci

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ObjectiveReducing roughage feeding without negatively affecting rumen health is of interest in ruminant nutrition. We investigated the effects of roughage sources and concentrate types on growth performance, ruminal fermentation, and blood metabolite levels in growing cattle.MethodsIn this 24-week trial, 24 Hanwoo cattle (224±24.7 kg) were fed similar nitrous and energy levels of total mixed ration formulated using two kinds of roughage (timothy hay and ryegrass straw) and two types of concentrate mixes (high starch [HS] and high fiber [HF]). The treatments were arranged in a 2×2 factorial, consisting of 32% timothy–68% HS, 24% timothy–76% HF, 24% ryegrass–76% HS, and 17% ryegrass–83% HF. Daily feed intakes were measured. Every four weeks, blood were sampled, and body weight was measured before morning feeding. Every eight weeks, rumen fluid was collected using a stomach tube over five consecutive days.ResultsThe mean dry matter intake (7.33 kg) and average daily gain (1,033 g) did not differ among treatments. However, significant interactions between roughage source and concentrate type were observed for the rumen and blood parameters (p<0.05). Total volatile fatty acid concentration was highest (p<0.05) in timothy–HF-fed calves. With ryegrass as the roughage source, decreasing the roughage inclusion rate increased the molar proportion of propionate and decreased the acetate-to-propionate ratio; the opposite was observed with timothy as the roughage source. Similarly, the effects of concentrate types on plasma total protein, alanine transaminase, Ca, inorganic P, total cholesterol, triglycerides, and creatinine concentrations differed with roughage source (p<0.05).ConclusionDecreasing the dietary roughage inclusion rate by replacing forage neutral detergent fiber with that from non-roughage fiber source might be a feasible feeding practice in growing cattle. A combination of low-quality roughage with a high fiber concentrate might be economically beneficial.

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“…However the nutritional status of cattle can influence plasma triglyceride concentration (O'Kelly, 1968b). Given this, all plasma triglyceride concentrations within the current experiment were within the reference range for bovines.…”

Section: Triglyceridesmentioning

confidence: 96%

“…O' Kelly (1968a) and O'Kelly (1968b) reported that irrespective of diet, grazing pasture versus lucerne (25% CP), Bos indicus had plasma cholesterol concentrations that were higher (P < 0.05)…”

Section: Cholesterolmentioning

confidence: 99%

Biological responses of feedlot cattle to heat load

Lees¹

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Heat load is a significant animal welfare and cost of production issue worldwide. In the US alone heat load is reported to have an annual economic burden of > $300 million in the beef sector.Furthermore animal growth is often depressed during summer resulting in heat related decreases in weight gain of approximately 10 kg which coincides with a 7 day increase in days on feed. The reduced growth rate increases days on feed, thereby increasing the cost of production. Whilst the effects of heat load on cattle has been researched for a number of years, there is speculation as to the interactions between hot environmental conditions and livestock performance, reproduction, health and overall wellbeing. Therefore there is a need to develop a more comprehensive understanding of the dynamic responses of animals to heat load. The key focus of heat load research is to develop effective management strategies to support animal comfort and performance during hot periods.While heat load can occur in pasture raised cattle, it is mostly observed within the intensive grain feed feedlot industry. Heat load occurs where a combination of environmental conditions exceed the animals ability to regulate body temperature, thus impacting on homeostasis. However how an animal responds to heat load is also dependent on a number of individual characteristics, including genotype, coat characteristics, health status and days on feed. Therefore no two animals will respond to hot climatic conditions in exactly the same manner. There are numerous responses to heat load that can be measured and/or observed in cattle, including changes in behaviour, respiratory dynamics, blood metabolites and body temperature. The experiments within this thesis were focused on investigating the; A key aspect in managing heat load is that feedlot personnel are able to recognise the responses of cattle to high heat load. Improvements in animal management have contributed to alleviating some of the negative effects of heat load. However summer conditions are still responsible for significant production losses and welfare concerns worldwide. Furthermore heat load cannot be completely eradicated where there are animal production operations in tropical and sub-tropical regions.Therefore the primary purpose of heat load research becomes focused on the effective use of mitigation strategies prior to and during heat related stress events, thus improving animal survivability and welfare during these events.iii Declaration by author Publications included in this thesisNo publications included. Contributions by others to the thesis

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Comparative Studies of Lipid Metabolism in Zebu and British Cattle in a Tropical Environment. II. Blood Lipid Levels of Cattle on Different Diets

Cited by 15 publications

References 9 publications

The Effects of Tick (Boophilus Microplus) Infestations on the Blood Composition of Shorthorn X Hereford Cattle on High and Low Planes of Nutrition

The Effects of Tick (Boophilus Microplus) Infestations on the Blood Composition of Shorthorn X Hereford Cattle on High and Low Planes of Nutrition

Effects of reducing inclusion rate of roughages by changing roughage sources and concentrate types on intake, growth, rumen fermentation characteristics, and blood parameters of Hanwoo growing cattle (Bos Taurus coreanae)

Biological responses of feedlot cattle to heat load

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