Serum luteinizing hormone levels in cattle under various reproductive states

Mori, Junichi; Masaki, Junji; Wakabayashi, Keiji; Endo, Toshiaki; Hosoda, Tatsuo

doi:10.1016/0093-691x(74)90031-4

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…However, Karg et al (1976) and Secchiari et al (1976) concluded that there is no evidence of seasonal effect, as bulls born at different times showed a similar testosterone pattern during development. The serum LH profile recorded in the present study disagrees with the conflicting reports on LH concentrations in bull calves ; concentrations have been found not to vary with age (Schams & Butz, 1972;Karg et ai, 1976), to increase between 1 and 7 months (Rawlings et al, 1972;Mori, Masaki, Wakabayashi, Endo & Hosoda, 1974), to increase between 3 and 4 months only (Amann & Walker, 1983), or to increase from 7 months of age to adulthood (Gombe, Hall, McEntee, Hansel & Pickett, 1973). Some of these discrepancies could be due in part to a pulsatile pattern of release (Gombe et ai, 1973;Thibier, 1975;McCarthy et al, 1979;Schanbacher, 1981) and to insufficient blood sampling or the low number of animals studied.…”

Section: Discussioncontrasting

confidence: 81%

Serum profiles of androstenedione, testosterone and LH from birth through puberty in buffalo bull calves

Hemeida¹,

El-Baghdady²,

El-Fadaly³

1985

Reproduction

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EgyptSummary. Blood samples were taken once per week for 4\p=n-\7 weeks from 59 buffalo calves in 14 age groups, 1\p=n-\2 months apart. Hormones were quantified by validated radioimmunoassays. Values of androstenedione and testosterone were low at birth (141\m=.\3\ m=+-\ 33\m=.\5 pg/ml and 18\m=.\0 \ m=+-\ 2\m=.\9 pg/ml, respectively; mean \m=+-\s.d.). Serum androstenedione concentrations gradually increased from birth until 8 months of age and declined (P < 0\m=.\05 thereafter, whereas mean testosterone values were low up to 8 months and then significantly (P < 0\m=.\05 increased as age advanced. LH concentrations averaged 2\m=.\12\ m=+-\ 0\m=.\47 ng/ml at birth. Thereafter, a decline in LH values was followed by an increase between 6 and 15 months of age. We conclude that, in buffalo bull calves, the pubertal period occurs from about 8 to 15 months of age. For pubertal buffalo bulls 15\p=n-\17months of age, serum concentrations of androstenedione, testosterone and LH were 156\m=.\9 \m=+-\ 54\m=.\6 pg/ml, 208\m=.\4 \m=+-\93\m=.\8pg/ml and 2\m=.\10 \m=+-\ 0\m=.\70 ng/ml, respectively.

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Section: Discussioncontrasting

confidence: 81%

Serum profiles of androstenedione, testosterone and LH from birth through puberty in buffalo bull calves

Hemeida¹,

El-Baghdady²,

El-Fadaly³

1985

Reproduction

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“…The variations of plasma LH concentrations in bull calves during the first year of life are a subject of controversy: LH is said not to vary (Odell, Hescox & Kiddy, i970;Karg et al, 1976), to increase during the first months after birth (Rawlings, Hafs & Swanson, 1972;Mori, Masaki, Wakabayashi, Endo & Hosoda, 1974) or to increase later (Gombe, Hall, McEntee, Hansel & Pickett, 1973). Lacroix, Gamier & Pelletier (1977) reported that plasma LH in 10 Charoláis bull calves increased shortly after birth, fluctuated widely from the 5th to the 20th week and finally decreased and remained relatively steady up to 1 year of age.…”

Section: Introductionmentioning

confidence: 99%

Short-term variations in plasma LH and testosterone in bull calves from birth to 1 year of age

Lacroix¹,

Pelletier²

1979

Reproduction

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“…Thus plasma LH is said not to vary between the third and twelfth months of age (Odell, Hescox and Kiddy, 1970 ;Karg et a/., 1976) to increase between the first and seventh months (Mori et al, 1974) or to increase from seven months of age to adulthood (Gombe et al,1973). Similarly although plasma testosterone was found to increase with age, this increase was said to be erratic (Rawlings, Hafs and Swanson, 1972) or multiphasic (Secchiari et al, 1976).…”

mentioning

confidence: 99%

Temporal fluctuations of plasma LH and testosterone in Charolais bull calves during the first year of life

Lacroix¹,

Garnier²,

Pelletier³

et al. 1977

Ann. Biol. anim. Bioch. Biophys.

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Some of these discrepancies could be due in part to a pulsatile pattern of relaese which has been described for LH both in adult (Katongole, Naftolin and Short, 1971) and young bulls (Gombe et al., 1973 ;Thibier, 1975). They could arise also from insufficient blood samplings or number of animals studied.This confusing situation in the bull contrasts with our knowledge in the sheep in which the prepubertal period is associated with a pulsatile pattern of LH followed by a decrease in the level after puberty, whereas testosterone increases linearly (Foster, 1974 ;Courot, de Reviers and Pelletier, 1975).Thus, in an attempt to clarify the endocrine changes around puberty the concurrent patterns of plasma LH and testosterone were followed in Charolais calves from birth till one year of age.

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Serum luteinizing hormone levels in cattle under various reproductive states

Cited by 11 publications

References 9 publications

Serum profiles of androstenedione, testosterone and LH from birth through puberty in buffalo bull calves

Serum profiles of androstenedione, testosterone and LH from birth through puberty in buffalo bull calves

Short-term variations in plasma LH and testosterone in bull calves from birth to 1 year of age

Temporal fluctuations of plasma LH and testosterone in Charolais bull calves during the first year of life

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