Use of time-dependent transition probabilities for quantitative analysis of ingestive behavior of sheep: Part II

Revista Brasileira de Zootecnia

Lobato, José Fernando Piva³  Dutilleul, Pierre¹  Dèspres, Lionel²  Fischer, Vívian⁴  Deswysen, Armand Gerard² 

[1] McGill University, Canadá;Université Catholique de Louvain, Bélgica;Universidade Federal do Rio Grande do Sul;Universidade Federal de Pelotas, Brasil

关键词: finite Fourier transform;    periodograms;    phase diagrams     IntroduçãoA maioria dos trabalhos não apresenta uma análise quantitativa da distribuição do tempo despendido nas atividades ingestivas;    e;    até recentemente;    os métodos quantitativos na análise comportamental de grande parte destes trabalhos basearam-se na aplicação dos métodos estatísticos univariados;   

DOI  :  10.1590/S1516-35982000000600031

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The ingestive behavior patterns were evaluated in nine sheep 1/2 Texel + 1/2 Ile-de-France over a six month period. Sheep were fed the diet at 9 a.m. and 4 p.m., which was composed by 250 g of concentrate (15.45% CP, 36.54% NDF) and ad libitum grass hay (6.69% CP, 69.10% NDF). Ingestive behavior was continuously measured for five days per period, and its activities or states were classified as eating, ruminating or idling, and sequentially registered. The probability estimates incorporated three types: The probabilities of being in a given state, of staying in a given state and of changing from a state to another one. Finite Fourier transformation was applied to the series of probabilities estimated at each five minutes, during 22 hours per day. In the nycterohemeral probabilities distribution study, it was used the analysis of periodgrams, phase diagrams and analysis of variance upon the transformed values of the probabilities series. The analysis of variance showed that all probability types followed a nycterohemeral distribution, and it was significantly affected by experimental period and animals at several frequencies. Analysis of periodgrams and phase diagrams showed that differences between the experimental periods and animals was mainly due to differences in the amplitude of trigonometric functions that described the nycterohemeral distribution of probabilities of being or staying in a given state. The day moment, the experimental period and individuals affected the nycterohemeral distribution of the transition state probabilities.

【 授权许可】

CC BY-NC