Výsledky vyhledávání - "K. L. Macmillan"

An evaluation of the use of synchrony technology in beef breeding herds

Publikováno v: Animal Science. 67:269-276

A model which was originally developed to derive the probability density of a calving distribution for beef cows under natural breeding has been modified to incorporate the effects of using oestrous synchronization at the beginning of the breeding pe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::399544fa70916a9d217a12cbbe53f247
https://doi.org/10.1017/s135772980001002x

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Feed conversion efficiency, daily pasture intake, and milk production of primiparous Friesian and Jersey cows calved at two different liveweights

Autor: T. R. Mackle, G. K. Stakelum, C. R. Parr, A. M. Bryant, K. L. MacMillan

Publikováno v: New Zealand Journal of Agricultural Research. 39:357-370

Pasture dry matter intake (DMI), milk yield and composition, and calculated feed conversion efficiencies (FCE), were monitored throughout lactation for primiparous Friesian (n = 16; F) and Jersey (n = 16; J) cows calved at either high (H) or low (L)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::045289f327b925f8d953fc7e678dc7e1
https://doi.org/10.1080/00288233.1996.9513195

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Concentrations of oestrone sulphate during pregnancy in milk from Jersey and Friesian dairy cows differing in milk yield and composition

Autor: K L Macmillan, Karanikolas M, Kenealy L, Henderson Km

Publikováno v: New Zealand Veterinary Journal. 42:89-92

Oestrone sulphate concentrations were measured by radioimmunoassay in milk samples obtained weekly during pregnancy from Jersey and Friesian cows, with each breed grazed at two different stocking rates. Mean milk yields differed significantly (P

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5eb708204385bf9789f0c4fe49458c46
https://doi.org/10.1080/00480169.1994.35793

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Plasma concentrations of inhibin a and follicle-stimulating hormone differ between cows with two or three waves of ovarian follicular development in a single estrous cycle

Autor: K I, Parker, D M, Robertson, N P, Groome, K L, Macmillan

Publikováno v: Biology of reproduction. 68(3)

Patterns of ovarian follicle development were monitored daily in Holstein-Friesian cows that had two (n = 4) or three (n = 4) waves of ovarian follicle development during a single estrous cycle. The plasma from daily blood samples was used in assays

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::c71500381f0d8e31c82e8d2156f34d58
https://pubmed.ncbi.nlm.nih.gov/12604631

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Controlled-release products for the control of the estrus cycle in cattle, sheep, goats, deer, pigs, and horses

Autor: M J, Rathbone, K L, Macmillan, W, Jöchle, M P, Boland, E K, Inskeep

Publikováno v: Critical reviews in therapeutic drug carrier systems. 15(4)

This paper describes the estrus cycles of a number of livestock breeds and reviews the controlled-release drug delivery systems that are currently available for the purpose of controlled breeding. The bovine estrus cycle is reviewed in detail, and th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::208c49e484d0bbd21d8e2926c201be4e
https://pubmed.ncbi.nlm.nih.gov/9736416

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Impact of exporting dependence on livestock production systems, industry structure, and research

Autor: A H Kirton, K L Macmillan

Publikováno v: Journal of animal science. 75(2)

From 84 to 93% of New Zealand's annual production from livestock is exported to over 100 markets throughout the world. This export dependence has produced production systems that are low-cost because the Mediterranean maritime climate allows animals

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8529ec1507d5b67c752d67cf8ad7043f
https://pubmed.ncbi.nlm.nih.gov/9051476

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Physiological effects of undernutrition on postpartum anoestrus in cows

Autor: P D, Jolly, S, McDougall, L A, Fitzpatrick, K L, Macmillan, K W, Entwistle

Publikováno v: Journal of reproduction and fertility. Supplement. 49

The focus of this review is the physiological effects of undernutrition on ovarian follicle growth and the occurrence of ovulation in postpartum cows. Evidence suggests that moderate levels of underfeeding, before or after calving, may interfere with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::f0987b6ba22e215ad2919a85c34dfd8e
https://pubmed.ncbi.nlm.nih.gov/7623336

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Effects of an agonist of gonadotropin-releasing hormone on ovarian follicles in cattle

Autor: K L, Macmillan, W W, Thatcher

Publikováno v: Biology of reproduction. 45(6)

Three experiments were conducted to examine effects of Buserelin, a potent agonist of gonadotropin-releasing hormone, on characteristics of ovarian follicles in cycling cows and heifers. In experiment 1, heifers were injected once with 10 micrograms

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::19401eaa01443f448b96e7afb2765163
https://pubmed.ncbi.nlm.nih.gov/1805991

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