Agreement between ultrasonographic classification of the CL and plasma progesterone concentration in dairy cows
Articolo
Data di Pubblicazione:
1999
Citazione:
Agreement between ultrasonographic classification of the CL and plasma progesterone concentration in dairy cows / M. Battocchio, G. Gabai, A. Mollo, M.C. Veronesi, F. Soldano, G. Bono, F. Cairoli. - In: THERIOGENOLOGY. - ISSN 0093-691X. - 51:6(1999), pp. 1059-1069. [10.1016/S0093-691X(99)80011-9]
Abstract:
We evaluated the agreement between ultrasonographic characteristcs of the corpus
luteum (CL) and plasma progesterone (P4) concentration in dairy cows. In Phase 1 of the
study, the ovaries of 8 cows were ultrasonographically examined, and P4 was analyzed
daily from estrus (Day 0) to Day 4, then at Day 7 and Day 10, and again daily from Day 17
to the onset of next estrus. In Phase 2, the ovaries of 157 randomly selected Friesian cows
were examined once by ultrasonography, and blood samples collected concurrently were
analyzed for plasma P4. On the basis of the P4 values, the function of CLs was classified as
follows: 1) non-secretory CLwben plasma P4 was lower than 1 ng/mL(n=41);2)
evolving CL when plasma P4 was between t and 4 ng/mL (n=55); and 3) mid-cycle CL
when plasma P4 was more than 4 ng/mL (n=61). On the basis of ultrasonographic
examination, 3 additional groups were established (absence of CL, evolving CL, midcycle
CL). Ultrasonographic characteristics and size of Day 3 to 4 CLs and their respective
plasma P4 concentrations were not distinguishable from those of CLs observed 3 to 4 d
before the susequent estrus. The degree of agreement between the two classification was
72%. The data indicate that the functional classification of CLs is difficult to determine
based on ultrasonography alone.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Classification; Corpus luteum; Dairy cow; P4; Ultrasonography
Elenco autori:
M. Battocchio, G. Gabai, A. Mollo, M.C. Veronesi, F. Soldano, G. Bono, F. Cairoli
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