Ian Lean

Adjunct Professor

University of Sydney

Australia

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About

Ian Lean is an Adjunct Professor at the University of Sydney in Australia. His research focuses on dairy cow physiology, nutrient metabolism, and the implications of dietary imbalances on animal health and productivity. Recent articles include studies on plasma lipid profiles in dairy herds, the role of milk as a diagnostic fluid, and the effects of feed additives on rumen function. He actively contributes to the understanding of livestock nutritional strategies and their societal implications.

Articles (18)

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2025

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2025

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2025

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2024

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2024

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2024

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2024

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2024

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2023

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2023

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2023

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2023

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2023

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2022

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2021

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2021

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2021

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2020

Collaborators (6)

heidi rossow

UNITED STATES

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Priyanka Reddy

University of Melbourne

AUSTRALIA

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Stephen LeBlanc

Professor

University of Guelph

CANADA

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Jennifer Thomson

Associate Professor- Animal Genetics

Montana State University

UNITED STATES

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Wayne Bryden

University of Sydney

AUSTRALIA

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Ruth Zadoks

Professor of Production Animal Health

University of Sydney

AUSTRALIA

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Ian Lean

Research Interests

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Articles (18)

Confinement and pasture-based dairy herds differ in plasma lipid profiles

Associations among body condition score, body weight, and serum biochemistry in dairy cows

A large multisite lipidomic investigation of parity and aging in dairy cows

Milk as a diagnostic fluid

Modeling differences in feed intake and efficiency: Growing and finishing beef cattle

Invited review: Ruminal acidosis and its definition—A critical review

Periparturient Mineral Metabolism: Implications to Health and Productivity

Milk as an indicator of dietary imbalance

Associations of parity with health disorders and blood metabolite concentrations in Holstein cows in different production systems

Increased parity is negatively associated with survival and reproduction in different production systems

Associations among the genome, rumen metabolome, ruminal bacteria, and milk production in early-lactation Holsteins

Effects of feed additives on rumen function and bacterial and archaeal communities during a starch and fructose challenge

The societal role of meat: the Dublin Declaration with an Australian perspective

Holstein dairy cows lose body condition score and gain body weight with increasing parity in both pasture-based and total mixed ration herds

Effects of mannan-oligosaccharide and Bacillus subtilis supplementation to preweaning Holstein dairy heifers on body weight gain, diarrhea, and shedding of fecal pathogens

Cattle, climate and complexity: food security, quality and sustainability of the Australian cattle industries

Effect of 25-hydroxyvitamin D3 during prepartum transition and lactation on production, reproduction, and health of lactating dairy cows

Variation in milk production, fat, protein, and lactose responses to exogenous feed enzymes in dairy cows

Collaborators (6)

heidi rossow

Priyanka Reddy

Stephen LeBlanc

Jennifer Thomson

Wayne Bryden

Ruth Zadoks

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