Effects of weaning, supplementation and gender on acquired immunity to Haemonchus contortus in lambs

International Journal for Parasitology
K L ShawH S Gill

Abstract

This study was designed to investigate whether delaying the age of weaning, or feeding a protein-rich supplement alters the rate at which lambs develop immunity to Haemonchus contortus and whether there is any interaction between nutrition, stress of weaning, and gender and the development of this immunity. Ninety-six Merino lambs were allocated to one of four treatment groups: supplemented-unweaned; supplemented-weaned; unsupplemented-unweaned; unsupplemented-weaned. There were approximately similar numbers of male and female lambs in each group. Supplemented lambs received 80 g/head/day of a protein-rich pellet from 16 to 23 weeks of age. Over the same period the lambs were drenched with 300 H. contortus larvae twice per week. Faecal worm egg counts were determined every week, and PCV and liveweight every 2 weeks for each lamb. Neither weaning nor sex had any effect on PCV (P > 0.05) but from day 50 after the start of infection, the decline in PCV was more pronounced in unsupplemented than in supplemented lambs. Faecal worm egg counts were higher (P < 0.001) in unsupplemented-weaned than in supplemented-weaned lambs and in females when compared with castrates (P < 0.03). There was a weaning x supplementation x age interaction...Continue Reading

References

Sep 1, 1991·Research in Veterinary Science·D L Watson, H S Gill
Dec 1, 1990·International Journal for Parasitology·R R WoolastonL R Piper
Feb 1, 1990·Journal of Steroid Biochemistry·A H Schuurs, H A Verheul
Oct 1, 1987·International Journal for Parasitology·G A AlbersI A Barger
Jul 1, 1982·Reviews of Infectious Diseases·W R Beisel
Nov 1, 1994·The British Journal of Nutrition·I KyriazakisF Jackson
Jul 1, 1993·International Journal for Parasitology·I A Barger

❮ Previous
Next ❯

Citations

Nov 1, 1996·International Journal for Parasitology·M F van Houtert, A R Sykes
Sep 24, 2015·Veterinary Parasitology·Nadino CarvalhoAlessandro F T Amarante
Jun 13, 2020·Expert Review of Anti-infective Therapy·Alba CortésCinzia Cantacessi
Nov 28, 2017·Tropical Animal Health and Production·A HaileB Rischkowsky
Oct 27, 2020·Frontiers in Veterinary Science·Cesar Henrique Espírito Candal PoliJames Pierre Muir
Apr 23, 2021·Applied Microbiology and Biotechnology·Rongrong LiaoLihui Zhu

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.