Search results for: J.J. Murphy

Items from 1 to 20 out of 51 results

article

Evaluation of a high-fibre total mixed ration as a dry cow feeding strategy for spring-calving Holstein Friesian dairy cows

M. Butler, J. Patton, J.J. Murphy, F.J. Mulligan

Livestock Science > 2011 > 136 > 2-3 > 85-92

This study compared the milk production, body condition score (BCS), bodyweight (BW), plasma analyte profiles and reproductive performance, of spring-calving Holstein Friesian cows offered either grass silage or a wheat straw-based total mixed ration (TMR) during the dry period. Fifty-eight multiparous cows were paired according to parity (2, 3 or >3), expected calving date and BCS, and randomly...

article

A model of nitrogen efficiency in contrasting grass-based dairy systems

W. Ryan, D. Hennessy, J.J. Murphy, T.M. Boland, more

Journal of Dairy Science > 2011 > 94 > 2 > 1032-1044

Nitrogen (N) efficiency is one of the key drivers of environmentally and economically sustainable agricultural production systems. An N balance model was developed, evaluated, and validated to assess N use efficiency and N surplus and to predict N losses from contrasting grass-based dairy production systems in Ireland. Data from a 5-yr study were used to evaluate and validate the model. Grass-based...

article

A comparison between Holstein-Friesian and Jersey dairy cows and their F1 hybrid on milk fatty acid composition under grazing conditions

R.A. Palladino, F. Buckley, R. Prendiville, J.J. Murphy, more

Journal of Dairy Science > 2010 > 93 > 5 > 2176-2184

The objective of this study was to investigate the effect of 2 breeds, Holstein and Jersey, and their F ₁ hybrid (Jersey × Holstein) on milk fatty acid (FA) concentrations under grazing conditions, especially conjugated linoleic acid (CLA) and n-3 polyunsaturated fatty acids because of their importance to human health. Eighty-one cows (27 per breed grouping) were allocated a predominantly...

article

Extended lactations in a seasonal-calving pastoral system of production to modulate the effects of reproductive failure

S.T. Butler, L. Shalloo, J.J. Murphy

Journal of Dairy Science > 2010 > 93 > 3 > 1283-1295

This study was conducted to determine whether extending the calving interval (CI) to 24 mo would be an alternative to culling and replacing cows that had failed to become pregnant. Forty-six nonpregnant lactating cows were assembled in November 2004 and assigned to receive either 3kg (low) or 6kg (high) of concentrate supplement and a basal diet of grass silage and maize silage over the winter period...

article

Short communication: The effect of dry period duration and dietary energy density in early lactation on the rennet gelation properties of milk

S.T. Butler, M.A. de Feu, B. O’Brien, T.P. Guinee, more

Journal of Dairy Science > 2010 > 93 > 2 > 524-528

This study was carried out to examine the effects of decreasing the dry period (DP) duration and altering the energy density of the diet during early lactation on the rheological characteristics of milk. Forty mature Holstein-Friesian cows were used in a completely randomized design with a 2 × 2 factorial arrangement of treatments. Cows were randomly assigned to 1 of 2 dry period treatments and 1...

article

A note on the effect of dietary proportions of kale (Brassica oleracea) and grass silage on rumen pH and volatile fatty acid concentrations in dry dairy cows

B. Keogh, P. French, J.J. Murphy, J.F. Mee, more

Livestock Science > 2009 > 126 > 1-3 > 302-305

The objective of this study was to evaluate the effect of varying proportions of dietary kale on rumen pH and volatile fatty acid production. Four pregnant dry dairy cows permanently fitted with ruminal cannulae were randomly assigned to four kale: grass silage dietary proportions (0:100, K0; 60:40, K60; 85:15, K85 and 100:0, K100) on a dry matter basis in a 4×4 Latin Square design with four 20 day...

article

Fatty acid intake and milk fatty acid composition of Holstein dairy cows under different grazing strategies: Herbage mass and daily herbage allowance

R.A. Palladino, M. O’Donovan, J.J. Murphy, M. McEvoy, more

Journal of Dairy Science > 2009 > 92 > 10 > 5212-5223

The objective of this study was to investigate the effect of level of 1) pregrazing herbage mass (HM) and 2) level of daily herbage allowance (DHA) on the performance and fatty acid (FA) composition of milk from grazing dairy cows. Sixty-eight Holstein-Friesian dairy cows were allocated to either a high or low pregrazing HM (1,700 vs. 2,400kg of DM/ha; >40mm), and within HM treatment, cows were...

article

Grazing cows are more efficient than zero-grazed and grass silage-fed cows in milk rumenic acid production

R. Mohammed, C.S. Stanton, J.J. Kennelly, J.K.G. Kramer, more

Journal of Dairy Science > 2009 > 92 > 8 > 3874-3893

Six rumen-cannulated Holstein cows in early lactation were assigned to 3 treatments: grazing (G), zero-grazing (ZG), and grass silage (GS) harvested from the same perennial rye grass sward in a 3×3 Latin square design with three 21-d periods. The objectives of this study were to investigate the underlying mechanisms for the reported elevation in milk rumenic acid (RA) concentration associated with...

article

Pathways for conversion of char nitrogen to nitric oxide during pulverized coal combustion

A. Molina, J.J. Murphy, F. Winter, B.S. Haynes, more

Combustion and Flame > 2009 > 156 > 3 > 574-587

The conversion of nitrogen in char (char-N) to NO was studied both experimentally and computationally. In the experiments, pulverized coal char was produced from a U.S. high-volatile bituminous coal and burned in a dilute suspension at 1170 K, 1370 K and 1570 K, at an excess oxygen concentration of 8% (dry), with different levels of background NO. In some experiments, hydrogen bromide (HBr) was added...

article

Effect of milking frequency in early lactation on energy metabolism, milk production and reproductive performance of dairy cows

S. McNamara, J.J. Murphy, F.P. O'Mara, M. Rath, more

Livestock Science > 2008 > 117 > 1 > 70-78

The objective of this study was to evaluate the effect of imposing different milking frequencies for the first 4 weeks of lactation on energy balance, blood metabolic profiles and reproductive performance. The milking frequencies imposed were once daily for the first 4 weeks of lactation and twice daily subsequently (X1), twice daily for the entire lactation (X2) and three times daily for the first...

article

Supplementation of dairy cows with a fish oil containing supplement and sunflower oil to increase the CLA content of milk produced at pasture

J.J. Murphy, M. Coakley, C. Stanton

Livestock Science > 2008 > 116 > 1-3 > 332-337

It has been shown that the cis 9, trans 11 isomer of conjugated linoleic acid (CLA) can be increased in milk by supplementation with fish oil and vegetable oils. Feeding a high level of oil, however, can impact negatively on gross milk composition. The principal aim of this study was to determine if relatively low levels of fish oil or sunflower oil, either alone or in combination, offered to dairy...

article

How do clinicians diagnose acute heart failure?

J.J. Murphy, A. Fuat, H. Hancock, J. Mason

European Journal of Heart Failure, Supplement > 2008 > 7 > Supplement 1 > 67

article

How do clinicians diagnose acute heart failure?

J.J. Murphy, A. Fuat, H. Hancock, J. Mason

European Journal of Heart Failure, Supplement > 2008 > 7 > 1 > 67

article

Effect of pasture allowance and supplementation with maize silage and concentrates differing in crude protein concentration on milk production and nitrogen excretion by dairy cows

F. Burke, M.A. O'Donovan, J.J. Murphy, F.P. O'Mara, more

Livestock Science > 2008 > 114 > 2-3 > 325-335

Sixty cows (40 multiparous and 20 primiparous) averaging 140 days in milk (DIM) were assigned to five treatments to evaluate the effect of pasture allowance and supplements of a) maize silage b) high crude protein concentrate and, c) low crude protein concentrate on milk production and nitrogen (N) excretion. Two of the treatments (HG and LG) were offered herbage only (allowances of 20 and 15 kg dry...

article

Cheese Manufacture with Milk with Elevated Conjugated Linoleic Acid Levels Caused by Dietary Manipulation

M. Coakley, E. Barrett, J.J. Murphy, R.P. Ross, more

Journal of Dairy Science > 2007 > 90 > 6 > 2919-2927

The objective of this study was to assess the effect of dietary supplementation of cows on pasture with sunflower oil for conjugated linoleic acid (cis-9, trans-11 CLA) enrichment of milk, for the production of CLA-enriched cheese. A group of 40 autumn-calving dairy cows were assigned to either a control group (indoor feeding on grass silage ad libitum and 6 kg/d of a typical indoor concentrate) or...

article

Get fit for your op

J.J. Murphy, Barbara Conway

European Journal of Cardiovascular Nursing > 2007 > 6 > Supplement > S7-S8

article

Comparative Evaluation of Alternative Forages to Grass Silage in the Diet of Early Lactation Dairy Cows

F. Burke, J.J. Murphy, M.A. O’Donovan, F.P. O’Mara, more

Journal of Dairy Science > 2007 > 90 > 2 > 908-917

Fifty-six autumn-calving Holstein-Friesian cows, blocked on the basis of days in milk (27.6±10.65 d), lactation number (3.1±2.21), and preexperimental milk yield (28.4±6.69kg) were used to examine the effects of replacing 330 g/kg of dry matter (DM) of first-cut perennial ryegrass silage with either fermented whole-crop wheat (WCW), urea-treated processed WCW, or corn silage on subsequent feed intake,...

article

Relationships Among Milk Production, Energy Balance, Plasma Analytes, and Reproduction in Holstein-Friesian Cows

J. Patton, D.A. Kenny, S. McNamara, J.F. Mee, more

Journal of Dairy Science > 2007 > 90 > 2 > 649-658

Associations were examined between components and indicators of early lactation energy balance (EB) and measures of fertility in Holstein cows. Milk production, dry matter intake (DMI), body condition score (BCS), and endocrine and metabolite data from 96 cows were analyzed using multivariate logistic regression and survival analysis. Fertility variables investigated were interval to commencement...

article

Embryo survival in dairy cows managed under pastoral conditions

M.G. Diskin, J.J. Murphy, J.M. Sreenan

Animal Reproduction Science > 2006 > 96 > 3-4 > 297-311

Efficient pasture-based milk production systems require a compact calving pattern aligned to the onset of the grazing season, a 365-day calving interval and low culling rates for infertility. Achievement of these targets requires high herd reproductive performance. While high genetic merit Holstein cows produce more milk in grass-based systems their fertility is compromised. Management of the modern...

article

Effect of Milking Frequency and Diet on Milk Production, Energy Balance, and Reproduction in Dairy Cows

J. Patton, D.A. Kenny, J.F. Mee, F.P. O’Mara, more

Journal of Dairy Science > 2006 > 89 > 5 > 1478-1487

The objective of this study was to determine the effects of reduced milking frequency and increased dietary energy density in early lactation on milk production, energy balance, and subsequent fertility. Sixty-six spring-calving, multiparous Holstein-Friesian cows were assigned to 1 of 3 treatment groups: once-daily milking on a standard diet (1×ST); 3-times daily milking on a standard diet (3×ST);...

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Keywords

MILK PRODUCTION (8)
DAIRY COWS (7)
DAIRY COW (6)
CONJUGATED LINOLEIC ACID (5)
ENERGY BALANCE (4)
BLOOD METABOLITES (3)
POLY(URETHANE) (3)
VOLATILE EVOLUTION (3)
ALPHA RADIATION (2)
BODY CONDITION SCORE (2)
DAIRY CATTLE (2)
DRY COW (2)
EARLY LACTATION (2)
FULL FAT RAPESEED (2)
GRAZING (2)
MILK (2)
MILKING FREQUENCY (2)
PASTURE (2)
REPRODUCTION (2)
REPRODUCTIVE PERFORMANCE (2)
SUNFLOWER OIL (2)
HE 2 + IONS (1)
ALTERNATIVE FORAGE (1)
BEET PULP (1)
BREED (1)
CHAR (1)
CHEESE (1)
CLA (1)
COAL (1)
CONJUGATED LINEOLIC ACID (1)
COW PERFORMANCE (1)
COWS (1)
CROSSBRED (1)
DAILY HERBAGE ALLOWANCE (1)
DAIRY (1)
DIETARY ENERGY DENSITY (1)
DIGESTION (1)
DM INTAKE (1)
DRY PERIOD DURATION (1)
DRY PERIOD NUTRITION (1)
DUODENAL FLOW OF N (1)
DUODENAL PASSAGE (1)
ECONOMICS, AIR POLLUTION, ENVIRONMENTAL POLICY, MOTOR-VEHICLE EMISSIONS, AGRICULTURAL PRODUCTION. (1)
EMBRYO SURVIVAL (1)
ENERGETIC EFFICIENCY (1)
ENERGY FEEDING SYSTEM (1)
ENERGY REQUIREMENT (1)
ETHYLENE VINYLACETATE (1)
EXTENDED LACTATION (1)
FAT COMPOSITION (1)
FAT SUPPLEMENTS (1)
FATTY ACID PROFILE (1)
FATTY ACIDS (1)
FERTILITY (1)
FISH OIL (1)
GENETIC MERIT (1)
GRASS (1)
GRASSLAND (1)
HALOGEN (1)
HELIUM IONS (1)
HERBAGE MASS (1)
HOLSTEIN (1)
IGF-I (1)
INSULIN (1)
INTAKE (1)
JERSEY (1)
KALE (1)
LACTATION (1)
LINOLENIC ACID (1)
LIPID (1)
MAINTENANCE (1)
MAIZE DISTILLERS GRAIN (1)
MAIZE SILAGE (1)
MILK FAT COMPOSITION (1)
MN AND AA IN DAIRY COWS (1)
NEGATIVE ENERGY BALANCE (1)
NITRIC OXIDE (1)
NITROGEN BALANCE (1)
NITROGEN EXCRETION (1)
NITROGEN USE EFFICIENCY (1)
NITROGEN UTILIZATION (1)
OPTICAL PROPERTIES (1)
OXYTOCIN (1)
PASTURE-BASED SYSTEMS (1)
PERENNIAL RYEGRASS (1)
POLY(ESTER) (1)
POLY(SILOXANE) (1)
POLYSILOXANE RUBBER (1)
PRE-CALVING FEEDING (1)
PREDICTION (1)
PRODUCTION (1)
PROFITABILITY (1)
PROGESTERONE (1)
PROSTAGLANDIN (1)
PYROLYSIS (1)
RAPESEED (1)
RENNET GELATION (1)
RGA (1)
RUMEN DEGRADABLE PROTEIN (1)
RUMEN PH (1)
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INFONA - science communication portal

Search results for: J.J. Murphy

Evaluation of a high-fibre total mixed ration as a dry cow feeding strategy for spring-calving Holstein Friesian dairy cows

A model of nitrogen efficiency in contrasting grass-based dairy systems

A comparison between Holstein-Friesian and Jersey dairy cows and their F1 hybrid on milk fatty acid composition under grazing conditions

Extended lactations in a seasonal-calving pastoral system of production to modulate the effects of reproductive failure

Short communication: The effect of dry period duration and dietary energy density in early lactation on the rennet gelation properties of milk

A note on the effect of dietary proportions of kale (Brassica oleracea) and grass silage on rumen pH and volatile fatty acid concentrations in dry dairy cows

Fatty acid intake and milk fatty acid composition of Holstein dairy cows under different grazing strategies: Herbage mass and daily herbage allowance

Grazing cows are more efficient than zero-grazed and grass silage-fed cows in milk rumenic acid production

Pathways for conversion of char nitrogen to nitric oxide during pulverized coal combustion

Effect of milking frequency in early lactation on energy metabolism, milk production and reproductive performance of dairy cows

Supplementation of dairy cows with a fish oil containing supplement and sunflower oil to increase the CLA content of milk produced at pasture

How do clinicians diagnose acute heart failure?

How do clinicians diagnose acute heart failure?

Effect of pasture allowance and supplementation with maize silage and concentrates differing in crude protein concentration on milk production and nitrogen excretion by dairy cows

Cheese Manufacture with Milk with Elevated Conjugated Linoleic Acid Levels Caused by Dietary Manipulation

Get fit for your op

Comparative Evaluation of Alternative Forages to Grass Silage in the Diet of Early Lactation Dairy Cows

Relationships Among Milk Production, Energy Balance, Plasma Analytes, and Reproduction in Holstein-Friesian Cows

Embryo survival in dairy cows managed under pastoral conditions

Effect of Milking Frequency and Diet on Milk Production, Energy Balance, and Reproduction in Dairy Cows

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