Temat: dairy production - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of the covariance function approach with an iterative two-stage algorithm to the estimation of parameters of a random regression test day model for dairy production traits
Autorzy:: Szyda, J
Powiązania:: https://bibliotekanauki.pl/articles/2041979.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: animal genetics
random regression model
covariance function
dairy production
dairy cattle
Źródło:: Journal of Applied Genetics; 2001, 42, 2; 177-191
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The selection index and single-and multi-trait animal model evaluation of Polish Black-and-White cows
Autorzy:: Jagusiak, W
Zarnecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/2043444.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Polska
lactation
Polish Black cow
dairy cow
milk production
dairy cattle
animal model
fat content
breeding value
cow
selection index
genetic evaluation
Polish White cow
protein content
Źródło:: Journal of Applied Genetics; 2000, 41, 3; 171-179
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effects of different starch sources on metabolic profile, production and fertility parameters in dairy cows
Autorzy:: Mikula, R.
Nowak, W.
Jaskowski, J.
Mackowiak, P.
Pruszynska Oszmalek, E.
Powiązania:: https://bibliotekanauki.pl/articles/32449.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: starch source
metabolic profile
production
fertility parameter
dairy cow
cow
transition period
maize grain
starch
blood index
fertility
health status
Opis:: The objective of the study was to determine the effect of replacing triticale (high rumen degradable starch) with maize grain (low rumen degradable starch) during the transition period and the first 120 days of lactation on metabolic and hormonal profile indices, milk production and fertility performance in cows. Forty-eight Holstein-Friesian dairy cows were divided into 4 groups: TT (2.5 kg triticale grain/cow per day supplemented from 14 days prepartum to day 120 postpartum), TM (2.5 kg triticale grain/cow per day supplemented from day 14 before parturition to calving, and then 2.5 kg maize grain to 120 days of lactation), MT (2.5 kg maize grain/cow per day supplemented from day 14 before parturition to calving, and then 2.5 kg triticale grain to 120 days of lactation), MM (2.5 kg maize grain/cow per day supplemented from 14 days prepartum to day 120 postpartum). Blood samples were collected 3 weeks and 1 week before calving and on days 14, 56 and 70 of lactation, and they were analyzed in terms of concentrations of glucose, insulin, leptin, insulin-like growth factor I, nonesterified fatty acids, triglycerides, cholesterol, blood urea nitrogen and activities of aspartate aminotransferase and gamma glutamyl transpeptidase. Milk samples were collected twice a day at weekly intervals and analyzed for fat, protein and lactose. Milk yield and individual dry mater intake were recorded at weekly intervals. Body condition was estimated 3 weeks before calving, on parturition day and on days 14, 56 and 120 of lactation. Replacing triticale grain with maize grain in the transition period and during lactation positively affected fertility of lactating cows. An increased first service conception rate and shortening of the days open period was observed in MM and TM groups in comparison to those found in group MT (P ≤ 0.05). The lowest number of services per conception was recorded in groups MM and TM (P ≤ 0.05). Although the impact of milk production and the most of the blood indices were not significantly affected by this treatment, the results of the study suggest that maize grain in the transition period and lactation might be a more effective energy source for dairy cows than triticale grain.
Źródło:: Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Properties of the transmission-disequilibrium test for the detection of quantitative trait loci in livestock
Autorzy:: Szyda, J
Liu, Z.
Wild, V.
Powiązania:: https://bibliotekanauki.pl/articles/2044224.pdf
Data publikacji:: 1998
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transmission-disequilibrium test
German Holstein cattle
chromosome localization
milk production
power
simulated data
population
real data
detection
dairy cattle
simulation system
Opis:: The transmission-disequilibrium test (TDT) is a model-free method to detect linkage between a marker and a trait locus. Originally developed to map disease genes in human genetics, this statistic has been recently extended to deal with quantitative characters. The emphasis of current research is on investigating statistical properties of the test applied to data from livestock populations. For various constellations of sample parameters, it is shown via simulation that the empirically derived null hypothesis distribution of TDT remains in good agreement with its asymptotic distribution while its power is satisfactory only for very close linkage. TDT is then applied to a real data set from milk production data of a dairy cattle population.
Źródło:: Journal of Applied Genetics; 1998, 39, 4; 309-319
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A survey of anti-Ostertagia ostertagii antibody levels in bulk tank milk samples (BTM) in dairy herds in Lower Silesia Region (Poland)
Autorzy:: Ploneczka-Janeczko, K.
Piekarska, J.
Rypula, K.
Mazurkiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/31890.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: bulk tank milk
Lower Silesian region
Ostertagia ostertagi
Polska
antibody level
bulk tank
herd
bulk tank milk sample
ELISA test
optical density ratio
parasite
animal infection
production loss
cattle
dairy cattle
Opis:: This work presents serological evidence of cattle ostertagiosis in the Lower Silesia Region (Poland), based on the measurement of antibodies in bulk tank milk (BTM) samples. It represents the first evidence of this parasite examined with the use of the ELISA test and milk samples in Poland. The prevalence of Ostertagia ostertagii antibodies was determined in BTM from 32 dairy cattle herds. Antibodies to O. ostertagii were demonstrated in all herds. The optical density ratio (ODR) varied from -0.088 to 1.024. The mean ODR value in the examined region was 0.53.
Źródło:: Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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