Effects of age and live weight on fat 5 alpha-androstenone levels in young boars fed two planes of nutrition.

نویسنده

  • M Bonneau
چکیده

The aim of the present experiment was to determine whether age, live weight, or a combination of both, was the most important factor influencing fat 5 alpha-androstenone levels in male pigs. Three groups of 50 boars each were fed either on a liberal plane of nutrition (CTRL group) or were restricted (SW and SA groups). Fat 5 alpha-androstenone was measured three times in each pig (on biopsies at two different times and at slaughter) at either the same live weight (SW) or at the same age (SA) as CTRL boars. In addition, the genital tract was dissected at slaughter. SW boars (aged 169 days) exhibited higher fat 5 alpha-androstenone levels than CTRL boars (aged 139 days) when the first biopsy was taken at 80 kg of live weight (1.2 vs 0.8 microgram/g; P less than 0.05). By the time of the second biopsy (100 kg of live weight) and at slaughter (125 kg) there was no significant difference between the SW and CTRL groups, although the SW were 43-55 days older than the CTRL. At all three measurement times, fat 5 alpha-androstenone was lower in SA than in CTRL boars which were 21-36 kg heavier (0.5 vs 0.8 micrograms/g at 139 days; 0.9 vs 1.3 micrograms/g at 160 days; 1.2 vs 2.0 micrograms/g at 185 days; P less than 0.001). Partial correlations between fat 5 alpha-androstenone and age were significant at the first biopsy, whereas partial correlations with live weight were significant at all three times of measurement. In SA boars weighing 90 kg there was a significant correlation between fat 5 alpha-androstenone and all the developmental traits of the genital tract. In SW and CTRL pigs weighing 125 kg, fat 5 alpha-androstenone was significantly correlated with accessory sex gland development but not with testis or epididymis weight. From the present data it is concluded that both age and live weight had a significant effect on fat 5 alpha-androstenone levels in young, light boars. In older, heavier boars, age had no effect per se but live weight still had a significant influence on 5 alpha-androstenone concentrations. In boars weighing 90 kg, fat 5 alpha-androstenone level depended on sexual maturity. When the animals were sexually mature at 125 kg of live weight, 5 alpha-androstenone level depended on the individual's potentiality for steroid production, which is probably under genetic control.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Responses to restricted index selection and genetic parameters for fat androstenone level and sexual maturity status of young boars

A restricted index selection experiment was conducted over four generations in order to investigate whether it is possible to reduce fat androstenone (AND) level with no adverse effect on sexual maturity status in young boars. Fat AND level was measured on a biopsy sample of backfat taken at 118 kg live weight. Sexual maturity status was assessed by bulbo-urethral gland (BUG) thickness measured...

متن کامل

Social effects and boar taint: significance for production of slaughter boars (Sus scrofa).

A study was conducted to elucidate the effects of social factors on the concentrations of boar taint substances, androstenone and skatole, in boars. The factors included dominance (social rank) and the effects of strongly tainted animals on other members of the group. Four successive replicates of 100 pigs (50 boars + 50 gilts) with an average live weight of 24 kg were randomly allocated to 10 ...

متن کامل

Genetic parameters for male fertility and its relationship to skatole and androstenone in Danish Landrace boars.

Concerns have been raised regarding selection against the boar taint compounds, androstenone and skatole, due to potential unfavorable genetic correlations with important male fertility traits (i.e., selection of boars with low levels of these boar taint compounds might also reduce male fertility). Hence, the objective of this investigation was to study the genetic association between direct me...

متن کامل

A note on the metabolism of 5 alpha-androst-16-en-3-one in the young boar in vivo.

The metabolism of plasma 5 alpha-androst-16-en-3-one (androstenone) was studied in two young boars weighing about 100 kg in which a single dose of tritiated androstenone was injected intravenously. The peripheral blood of one boar was continuously sampled for 6 h after injection; the total radioactivity per liter of plasma increased up to 14 min after the injection, and then declined rather slo...

متن کامل

Effect of Different Levels of Germinated Barley on Live Performance and Carcass Traits in Broiler Chickens

An experiment was conducted to evaluate the effect of different levels of germinated barley (GB) on live performance and carcass traits in broiler chickens. The experiment lasted for 5 weeks starting from 7 days of age and ending at 42 days of age. Chicks (Ross 308) were fed six dietary treatments including a corn–soy diet (corn diet), a barley–soy diet (barley diet), a barley diet plus enzymes...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Reproduction, nutrition, developpement

دوره 27 2A  شماره 

صفحات  -

تاریخ انتشار 1987