The mean weight of marmoset expectant fathers was 410±8
g (mean±s.e.m., n
=14) for the first month of gestation and had increased to 424±11
g by the fifth month. Month five was significantly higher than month one (t
=0.001) and month two (t
=0.01). No other months were significantly different from each other. There was no weight difference in month one between marmoset control and expectant males (406±24, t
=0.9). Control males showed no differences in weight across the gestational months (for all t
>0.05. Expectant marmoset males showed significant weight change across the five gestational months (2.4–20.4% increase, F
=0.002) whereas control males did not (p
>0.05), . The greatest change in weight for expectant male marmosets occurred in the fourth and fifth months.
Figure 1 (a) Per cent change in male and (b) female body weight over the gestational range in common marmosets. Dark bars indicate expectant fathers and light bars indicate control males weighed for five consecutive months. A dark line is drawn across the 100% (more ...)
The mean weight of expectant tamarin males was 556±22 for the first month of gestation and increased to 568±22 by the sixth month. There was no difference in tamarin expectant males’ weight in month one from control males (567±24, t=0.2, p=0.9). Control males showed no significant differences whereas expectant tamarin males showed that month one was significantly different from month two (t=3.6, p=0.004), month four (t=6.3, p=0.0001), month five (t=7.5, p=0.0001) and month six (t=6.5, p=0.0001). Expectant tamarin males showed significant weight change across the six gestational months (1–8%, F=14.3, n=14, p=0.01) whereas control males showed no significant weight change, . The greatest weight change occurred in the last three months of gestation (4, 5 and 6).
Figure 2 (a) Per cent change in male and (b) female body weight over the gestational range in cotton-top tamarins. Dark bars indicate expectant fathers and light bars indicate control males weighed for six consecutive months. A dark line is drawn across the 100% (more ...)
Both female marmosets and tamarins also showed significant increase in weight over the gestational months (marmoset: F
=0.001; tamarin: F
=0.0001; and ). The average weight of female marmosets in the first month of gestation was 364.1±13.3
g (mean±s.e.m.) and weight increased to an average of 441.9±8.1
g by the last gestational month. Tamarin females weighed on average 529±17.7
g during the first month of gestation and increased to an average weight of 599.7±17.3
g by the last month before birth.