M.C. Hannah
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View article: Assessing phosphate sorption by soils: toward resolving the issues
Assessing phosphate sorption by soils: toward resolving the issues Open
Phosphorus (P) is an essential plant nutrient and also a potential environmental pollutant, which makes its proper management an ongoing issue. Orthophosphate (PO4) may be the most important form of soil P, and its partitioning between the…
View article: Grain Type Impacts Feed Intake, Milk Production and Body Temperature of Dairy Cows Exposed to an Acute Heat Event in Early Lactation
Grain Type Impacts Feed Intake, Milk Production and Body Temperature of Dairy Cows Exposed to an Acute Heat Event in Early Lactation Open
The frequency, duration and intensity of heat events in Australia are forecast to increase. Different grain types result in different heat loads on animals, so grain selection could reduce the impact of heat exposure. Thirty-two multiparou…
View article: Milk production of cows grazing pasture supplemented with grain mixes containing canola meal or corn grain or both over the first 100 days of lactation
Milk production of cows grazing pasture supplemented with grain mixes containing canola meal or corn grain or both over the first 100 days of lactation Open
Grain mixes varying in proportions of wheat grain, barley grain, canola meal, and corn grain were fed to grazing dairy cows in early lactation to determine the contribution of canola meal and corn grain to milk yield, BW, BCS, eating behav…
View article: Effect of forage type on swallowed bolus mass and a method for counting swallows in dairy cattle
Effect of forage type on swallowed bolus mass and a method for counting swallows in dairy cattle Open
Dry matter intake (DMI) is a primary determinant of milk production in grazing dairy cows and an ability to measure the DMI of individual cows would allow herd managers to formulate supplementary rations that consider the amount of nutrien…
View article: Dairy Cows Offered Fresh Chicory Instead of Ensiled Pasture during an Acute Heat Challenge Produced More Milk and Had Lower Body Temperatures
Dairy Cows Offered Fresh Chicory Instead of Ensiled Pasture during an Acute Heat Challenge Produced More Milk and Had Lower Body Temperatures Open
The frequency, duration, and intensity of heat waves in Australia are increasing. To reduce the impact of heat waves on milk production, novel management strategies are required. Altering the forage type and amount offered affect the heat …
View article: Estimating Existing Sorbed Soil Phosphate from its Effect on Subsequent Sorption: 1 Relations of Freundlich Parameters and Soil Properties
Estimating Existing Sorbed Soil Phosphate from its Effect on Subsequent Sorption: 1 Relations of Freundlich Parameters and Soil Properties Open
View article: Effects of Heat Stress in Dairy Cows Offered Diets Containing Either Wheat or Corn Grain during Late Lactation
Effects of Heat Stress in Dairy Cows Offered Diets Containing Either Wheat or Corn Grain during Late Lactation Open
Cereal grains that differ in the rate and extent of ruminal fermentation differ in heat increment and may be used to improve thermoregulation during heat stress. This experiment investigated the responses of dairy cows in late lactation to…
View article: An Improved Approach to Automated Measurement of Body Condition Score in Dairy Cows Using a Three-Dimensional Camera System
An Improved Approach to Automated Measurement of Body Condition Score in Dairy Cows Using a Three-Dimensional Camera System Open
Body condition scoring is a valuable tool used to assess the changes in subcutaneous tissue reserves of dairy cows throughout the lactation resulting from changes to management or nutritional interventions. A subjective visual method is ty…
View article: Prior Forage Type Influences Ruminal Responses to a Wheat Grain Challenge in Lactating Dairy Cows
Prior Forage Type Influences Ruminal Responses to a Wheat Grain Challenge in Lactating Dairy Cows Open
To increase the dry matter and metabolisable energy intake of cows, dairy farmers often supplement pasture with concentrates and conserved fodder. Feeding large amounts of highly fermentable concentrates to cows can result in metabolic iss…
View article: Dietary Fat and Betaine Supplements Offered to Lactating Cows Affect Dry Matter Intake, Milk Production and Body Temperature Responses to an Acute Heat Challenge
Dietary Fat and Betaine Supplements Offered to Lactating Cows Affect Dry Matter Intake, Milk Production and Body Temperature Responses to an Acute Heat Challenge Open
Supplementing the diet of lactating cows with ingredients that increase energy density, or reduce internal heat production, may reduce some of the negative impacts of hot weather on milk yield. Thirty-two dairy cows were assigned either: (…
View article: Predicting Immediate Marginal Milk Responses and Evaluating the Economics of Two-Variable Input Tactical Feeding Decisions in Grazing Dairy Cows
Predicting Immediate Marginal Milk Responses and Evaluating the Economics of Two-Variable Input Tactical Feeding Decisions in Grazing Dairy Cows Open
Feed is the largest variable cost for dairy farms in Australia, and dairy farmers are faced with the challenge of profitably feeding their cows in situations where there is significant variation in input costs and milk price. In theory, th…
View article: Measurement of Enteric Methane Emissions by the SF6 Technique Is Not Affected by Ambient Weather Conditions
Measurement of Enteric Methane Emissions by the SF6 Technique Is Not Affected by Ambient Weather Conditions Open
Despite the fact that the sulphur hexafluoride (SF6) tracer technique was developed over 25 years ago to measure methane production from grazing and non-housed animals, no studies have specifically investigated whether ambient wind speed, …
View article: Using estimated nutrient intake from pasture to formulate supplementary concentrate mixes for grazing dairy cows
Using estimated nutrient intake from pasture to formulate supplementary concentrate mixes for grazing dairy cows Open
In pasture-based dairy systems, feeding a complex concentrate mix in the parlor during milking that contains cereal grains and protein supplements has been shown to have milk production advantages over feeding straight cereal grain. This e…
View article: Manipulation of the pre-partum diet of dairy cows to promote early adaptation to perennial ryegrass herbage
Manipulation of the pre-partum diet of dairy cows to promote early adaptation to perennial ryegrass herbage Open
The diet of dairy cows in Ireland traditionally changes abruptly from predominantly pasture silage before calving to grazed perennial ryegrass immediately after calving. This potentially leads to problems with adaptation of microbes in the…
View article: Effects of Feeding either Red or White Grape Marc on Milk Production and Methane Emissions from Early-Lactation Dairy Cows
Effects of Feeding either Red or White Grape Marc on Milk Production and Methane Emissions from Early-Lactation Dairy Cows Open
Globally, annual production of grape marc (GM), the residue of skins, seeds and stems remaining after making wine, has been estimated to be approximately nine million tonnes. No previous studies have compared effects on milk production and…
View article: Evaluation of the n-alkane technique for estimating the individual intake of dairy cows consuming diets containing herbage and a partial mixed ration
Evaluation of the n-alkane technique for estimating the individual intake of dairy cows consuming diets containing herbage and a partial mixed ration Open
View article: Supplementing the diet of dairy cows with fat or tannin reduces methane yield, and additively when fed in combination
Supplementing the diet of dairy cows with fat or tannin reduces methane yield, and additively when fed in combination Open
Addition of fats to the diets of ruminants has long been known to result in a reduction in enteric methane emissions. Tannins have also been used to reduce methane emissions but with mixed success. However, the effect of feeding fat in com…
View article: Influence of proportion of wheat in a pasture-based diet on milk yield, methane emissions, methane yield, and ruminal protozoa of dairy cows
Influence of proportion of wheat in a pasture-based diet on milk yield, methane emissions, methane yield, and ruminal protozoa of dairy cows Open
Wheat is the most common concentrate fed to grazing dairy cows in Australia, but no studies have examined the effects of wheat proportion in a pasture-based diet on milk production and methane emissions. In this 47-d experiment, 32 Holstei…
View article: Volatile Fatty Acids in Ruminal Fluid Can Be Used to Predict Methane Yield of Dairy Cows
Volatile Fatty Acids in Ruminal Fluid Can Be Used to Predict Methane Yield of Dairy Cows Open
The dry matter intake (DMI) of forage-fed cattle can be used to predict their methane emissions. However, many cattle are fed concentrate-rich diets that decrease their methane yield. A range of equations predicting methane yield exist, bu…
View article: Effect of dietary fat supplementation on methane emissions from dairy cows fed wheat or corn
Effect of dietary fat supplementation on methane emissions from dairy cows fed wheat or corn Open
Diets that contain high proportions of either wheat or supplementary fat have been individually reported to reduce enteric methane production. The objective of this research was to determine the effect of dietary fat supplementation on met…
View article: Evaluation of the n-alkane technique for estimating herbage dry matter intake of dairy cows offered herbage harvested at two different stages of growth in summer and autumn
Evaluation of the n-alkane technique for estimating herbage dry matter intake of dairy cows offered herbage harvested at two different stages of growth in summer and autumn Open
View article: Forage type influences milk yield and ruminal responses to wheat adaptation in late-lactation dairy cows
Forage type influences milk yield and ruminal responses to wheat adaptation in late-lactation dairy cows Open
The effects of different wheat adaptation strategies on ruminal fluid pH, dry matter intake (DMI) and energy-corrected milk (ECM) were measured in 28 late-lactation dairy cows. Cows were fed either perennial ryegrass (PRG) hay or alfalfa h…
View article: Adaptation responses in milk fat yield and methane emissions of dairy cows when wheat was included in their diet for 16 weeks
Adaptation responses in milk fat yield and methane emissions of dairy cows when wheat was included in their diet for 16 weeks Open
Short-term studies have shown that feeding dairy cows diets containing a high proportion (>40%) of wheat may result in reduced milk fat concentration and reduced CH4 emissions (g of CH4/cow per d), but no long-term st…
View article: The ‘Dairy Nitrogen Fertiliser Advisor’ - a method of testing farmers’ fertiliser decisions against a meta-analysis N-response function
The ‘Dairy Nitrogen Fertiliser Advisor’ - a method of testing farmers’ fertiliser decisions against a meta-analysis N-response function Open
Decisions about using N fertiliser rely typically on rules based on expected average pasture responses to N applied, a flawed criterion from the perspective of production economic theory. In this paper, the rationale for a web-based tool c…
View article: Influence of feeding supplements of almond hulls and ensiled citrus pulp on the milk production, milk composition, and methane emissions of dairy cows
Influence of feeding supplements of almond hulls and ensiled citrus pulp on the milk production, milk composition, and methane emissions of dairy cows Open
Almond hulls and citrus pulp have been fed to dairy cows with variable responses for milk production, but no information exists on their effect on enteric methane emissions. This experiment examined the effects of dietary supplementation w…
View article: Wheat is more potent than corn or barley for dietary mitigation of enteric methane emissions from dairy cows
Wheat is more potent than corn or barley for dietary mitigation of enteric methane emissions from dairy cows Open
Wheat is the most common concentrate fed to dairy cows in Australia, but few studies have examined the effects of wheat feeding on enteric methane emissions, and no studies have compared the relative potencies of wheat, corn, and barley fo…
View article: Associations of high and low milk protein concentrations with energy allocation, milk production, and concentrations of blood plasma metabolites and hormones in Holstein-Friesian cows
Associations of high and low milk protein concentrations with energy allocation, milk production, and concentrations of blood plasma metabolites and hormones in Holstein-Friesian cows Open
A positive association between milk protein concentration (MPC) and reproductive performance in dairy cows has been shown in several studies globally. This association may positively influence farm productivity and profitability, particula…
View article: Variation in feeding behavior and milk production among dairy cows when supplemented with 2 amounts of mixed ration in combination with 2 amounts of pasture
Variation in feeding behavior and milk production among dairy cows when supplemented with 2 amounts of mixed ration in combination with 2 amounts of pasture Open
Variation in feeding behavior and milk production of grazing dairy cows fed a mixed ration was measured. Experiments were conducted in spring (early lactation) and autumn (late lactation) with 48 Holstein-Friesian dairy cows. Pasture allow…
View article: Incorporating mixed rations and formulated grain mixes into the diet of grazing cows: Effects on milk composition and coagulation properties, and the yield and quality of Cheddar cheese
Incorporating mixed rations and formulated grain mixes into the diet of grazing cows: Effects on milk composition and coagulation properties, and the yield and quality of Cheddar cheese Open
Effects of different strategies for feeding supplements to grazing dairy cows on the composition and coagulation properties of milk and the subsequent yield and quality of Cheddar cheese were measured. The experiment used milk from 72 Hols…
View article: A universal equation to predict methane production of forage-fed cattle in Australia
A universal equation to predict methane production of forage-fed cattle in Australia Open
The methods for estimating methane emissions from cattle as used in the Australian national inventory are based on older data that have now been superseded by a large amount of more recent data. Recent data suggested that the current inven…