Lactation curves of commercial ewes rearing lambs2

Abstract

Three-hour milk production measurements determined by machine milking at 3-d intervals throughout a 63-d lactation period were used to describe lactation curves for crossbred ewes lambing at 1 and 2 yr of age and rearing single and twin lambs. Age of ewe, type of rearing, and day of lactation affected (P < 0.05) milk production. Over the 63-d lactation, average daily milk production was 2.56 and 2.63 kg, respectively, for 1- and 2-yr-old ewes rearing single lambs and 2.73 and 3.47 kg, respectively, for 1- and 2-yr-old ewes rearing twins. Milk production of 2-yr-old ewes rearing twin lambs peaked at 21 d of lactation, and that of 1- and 2-yr-old ewes rearing singles peaked between 27 and 30 d of lactation. The largest differences in the lactation curves among age and rearing ewe classes were found in early lactation. These differences were reduced by midlactation, and by late lactation, milk production for all ewes was similar. Diurnal variation in milk production by ewes was evaluated in an 8 x 8 Latin square design. Diurnal variation in milk yield measurements of eight mature ewes, each bearing and rearing twin lambs, was similar between d 21 and 24 of lactation. Time of milk production measurements within a day did not affect yield determinations. Extrapolation from 3-h production estimates to daily milk production is valid in determining a ewe's milk contribution in support of lamb growth.

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

“…Ewes nursing single lambs presented higher average daily milk production (P<0.05), contrarily to the findings of Snowder & Glimp (1991), Ramsey et al (1998) and Cardellino & Benson (2002), who observed higher productions for ewes nursing twins.…”

Lactation curves and body weight changes of Alpine, Saanen and Anglo-Nubian goats as well as pre-weaning growth of their kids

“…Means within a column with different letters differ (P < 0.05). Cardellino and Benson (2002) who observed that TPY occur at the fifth week of lactation period for one-and two-year-old ewes rearing single and twin lambs. Gaddour et al (2007) mentioned that there are evident differences in the dairy ability of different racial groups subjected to the same environmental and feeding conditions.…”

Bafra koyunlarında bazı meme özellikleri ve kuzularda büyüme ile bu özelliklerin farklı süt kontrol yöntemleriyle tespit edilen süt verimi ve sağım özellikleriyle fenotipik korelasyonları

“…Bu işlemler saat 20.00 de tekrarlanmış ve akşam süt verimi tespit edilmiştir. Sabah ve akşam sağılan süt miktarları toplanarak koyunların günlük süt verimi bulunmuştur (7,8).…”

“…Elle sağım, makineli sağım, oksitosin enjeksiyonu + makineli sağım ve tart-emzir-tart bu yöntemler arasındadır (1,7,8,16,19). Türkiye' de koyunlarda süt verimi ile ilgili çalışmalarda genellikle elle sağım yöntemi kullanılmıştır.…”

“…(7,8,19). Kuzuların tartılmasında 20 g' a duyarlı ve 150 kg çekerli elektronik kantar kullanılmıştır.…”