Data on braininess in mammals, part 7: ontogenetic progression of brain mass in ruminants, from birth to adulthood

...continued from https://www.inaturalist.org/journal/milewski/96313-data-on-braininess-in-mammals-part-6-brain-mass-relative-to-carcass-mass-in-east-african-ungulates#

SACHER AND STAFFELDT (1974, https://www.youtube.com/watch?v=2_93p-_761k)

In decreasing order of adult body mass:

Taurotragus oryx adult body mass 560 kg, adult brain mass 480 g
neonatal body mass 31.5 kg, neonatal brain mass 252 g

Bos taurus adult body mass 520 kg, adult brain mass 456 g
neonatal body mass 25.0 kg, neonatal brain mass 199 g

Bos grunniens adult body mass 250 kg, adult brain mass 334 g
neonatal body mass 18.0 kg, neonatal brain mass 187 g

Cervus canadensis adult body mass 200 kg, adult brain mass 435 g
neonatal body mass 14.3 kg, neonatal brain mass 203 g

Cervus elaphus adult body mass 117 kg, adult brain mass 365 g
neonatal body mass 4.44 kg, neonatal brain mass 103 g

Rusa unicolor adult body mass 116 kg, adult brain mass 383 g
neonatal body mass 4.44 kg, neonatal brain mass 96 g

Rangifer tarandus adult body mass 105 kg, adult brain mass 288 g
neonatal body mass 3.76 kg, neonatal brain mass 105 g

Lama glama adult body mass 93 kg, adult brain mass 225 g
neonatal body mass 8.0 kg, neonatal brain mass 170 g

Axis axis adult body mass 88.5 kg, adult brain mass 219 g
neonatal body mass 4.17 kg, neonatal brain mass 78.6 g

Dama dama adult body mass 80 kg, adult brain mass 223 g
neonatal body mass 4.08 kg, neonatal brain mass 97.3 g

Ammotragus lervia adult body mass 66 kg adult brain mass 210 g
neonatal body mass 3.73 kg, neonatal brain mass 92 g

Ovis aries adult body mass 48.8 kg, adult brain mass 125 g
neonatal body mass 3.0 kg, neonatal brain mass 52 g

Vicugna vicugna adult body mass 45 kg, adult brain mass 198 g
neonatal body mass 4.0 kg, neonatal brain mass 104 g

Antilope cervicapra adult body mass 38.5 kg, adult brain mass 200 g
neonatal body mass 2.74 kg, neonatal brain mass 62 g

Capra hircus adult body mass 30 kg, adult brain mass 106 g
neonatal body mass 2.18 kg, neonatal brain mass 61.2 g

Muntiacus muntjak adult body mass 16 kg, adult brain mass 124 g
neonatal body mass 1.24 kg, neonatal brain mass 50 g

Cephalophus dorsalis adult body mass 13 kg, adult brain mass 93 g
neonatal body mass 0.79 kg, neonatal brain mass 39 g

Additional data for neonates only:

Elaphurus davidianus
neonatal body mass 11.5 kg, neonatal brain mass 177 g

Ovis dalli
neonatal body mass 3.22 kg, neonatal brain mass 92.5 g

RINGBERG ET AL. (1981, https://www.researchgate.net/profile/Robert-White/publication/249538004_Body_growth_and_carcass_composition_of_lean_reindeer_Rangifer_tarandus_tarandus_L_from_birth_to_sexual_maturity/links/5773221a08aeeec389541937/Body-growth-and-carcass-composition-of-lean-reindeer-Rangifer-tarandus-tarandus-L-from-birth-to-sexual-maturity.pdf)

Mean values for Rangifer tarandus tarandus (semi-domesticated), showing the ontogenetic sequence from neonates through juveniles to sexual maturity:

Newborn: body mass 4.5 kg, brain mass 108 g (n=6)

One month old: body mass 12.8 kg, brain mass 140.8 g (n=8)

Two months old: body mass 25.3 kg, brain mass 179.6 g (n=10)

One year old: body mass 53.1 kg, brain mass 207.1 g (n=3)

2-3 years old: body mass 60.3 kg, brain mass 229.1 g (n=4, consisting of 2 females and 2 males)

Additional data for Rangifer tarandus are found in

• Wemmer and Wilson (brain mass of adult female, with no data for body mass)
• Oboussier (1966): adult female body mass 72 kg, brain mass 278 g
• Kruska (1970), from Anthony (1938) and Mangold-Wirz (1966): adult body masses 92-105 kg, brain masses 265-287 g

CRILE AND QUIRING (1940, https://www.semanticscholar.org/paper/A-Record-of-the-Body-Weight-and-Certain-Organ-and-Crile-Quiring/f3121f593ff742452c79fabc8a43f744619a2b49)

Ovis aries (mean values, all from the same population)

near-term foetuses (n=2) body mass 2.72 kg, brain mass 53.8 g
infants (n=8 males) body mass 6.87 kg, brain mass 73.6 g
juveniles (n=5 females) body mass 8.55 kg, brain mass 71.5 g
juveniles (n=4 males) body mass 15.8 kg, brain mass 88.6 g
adolescents (n=7 females) body mass 52.1 kg, brain mass 106.5 g

Bos taurus (individual values)

3-day old infant (n=1) body mass 19.5 kg, brain mass 193.9 g
6-day old infant (n=1) body mass 22.0 kg, brain mass 215.2 g
adult (n=1) body mass 489.9 kg, brain mass 473.5 g

HUBBERT ET AL. (1972, https://pubmed.ncbi.nlm.nih.gov/4651636/ and https://www.cabidigitallibrary.org/doi/full/10.5555/19722204556)

Bos taurus

Foetuses (sample sizes not given):

foetal body mass 0.6 kg, brain mass 18.2 g
foetal body mass 1.2 kg, brain mass 28.5 g
foetal body mass 2.4 kg, brain mass 44.5 g
foetal body mass 4.8 kg, brain mass 69.6 g
foetal body mass 9.6 kg, brain mass 108.8 g
foetal body mass 19.2 kg, brain mass 170.1 g
foetal body mass 38.4 kg, brain mass 265.9 g

Term foetus = neonate:

body mass 38.4 kg, brain mass 265.9 g

Source for adults of Bos taurus:
Sisson S and Grossman J D (1953) The anatomy of domestic animals.
Swett et al. (1937) J Agr Res 55: 239ff
Adults body masses 259-720 kg, brain masses 325.5-480.5 g

to be continued in https://www.inaturalist.org/journal/milewski/96350-data-on-braininess-in-mammals-part-8-including-confusion-about-the-encephalisation-quotient-of-cavia-porcellus#...

Publicado el 29 de junio de 2024 por milewski